WO1997044638A1 - Quadrant light detector - Google Patents
Quadrant light detector Download PDFInfo
- Publication number
- WO1997044638A1 WO1997044638A1 PCT/US1997/000555 US9700555W WO9744638A1 WO 1997044638 A1 WO1997044638 A1 WO 1997044638A1 US 9700555 W US9700555 W US 9700555W WO 9744638 A1 WO9744638 A1 WO 9744638A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- mask
- baffle
- base
- reflective
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/42—Simultaneous measurement of distance and other co-ordinates
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S3/00—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received
- G01S3/78—Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using electromagnetic waves other than radio waves
- G01S3/782—Systems for determining direction or deviation from predetermined direction
- G01S3/783—Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived from static detectors or detector systems
- G01S3/7835—Systems for determining direction or deviation from predetermined direction using amplitude comparison of signals derived from static detectors or detector systems using coding masks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/16—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using electromagnetic waves other than radio waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S5/00—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations
- G01S5/16—Position-fixing by co-ordinating two or more direction or position line determinations; Position-fixing by co-ordinating two or more distance determinations using electromagnetic waves other than radio waves
- G01S5/163—Determination of attitude
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/66—Tracking systems using electromagnetic waves other than radio waves
Definitions
- the present invention relates generally to devices for determining the incoming direction of incident light and, more particularly, to devices that determine the incoming direction of incident light over a sector using a relatively small number of optical elements.
- a virtual reality simulator In a number of situations, it is desirable to know the direction of incidence of light from a light source. One such situation arises in the entertainment arena. It is often desirable for a virtual reality simulator to include a light detector that determines the direction of incoming light. Current virtual reality systems typically involve the use of complicated positional detectors that follow relatively complex focusing or alignment procedures.
- One such position detector employs a photodiode or charge-coupled device (CCD) array having multiple discrete sensing elements.
- CCD charge-coupled device
- Another such position detector uses a slit positioned to direct the incident light onto different optical elements depending on the angle of incidence of the light.
- Gray-coded multi-element arrays assess the angle of incidence of the laser light. While devices of this nature do provide positional information, they have a number of disadvantages. For one, they provide directional information or resolution about only one axis, which is aligned with the slit, and therefore, two such devices are necessary to provide dual axis resolution. Further, the detector's accuracy is dependent on the amount of optical elements in the arrays and, if CCD elements are used in the array, the detector's dynamic range is inherently limited. In light of the above, such devices are relatively expensive and complex.
- Another position detector employs a variety of separate discrete optical elements, each of which corresponds to a different angle of incidence of the light.
- the detector has a large number of elements, each of which is sensitive to a particular azimuth and elevation in the context of a polar coordinate system.
- Such a detector if it is to provide high resolution, necessitates a relatively large number of optical elements, since its accuracy is directly proportional to the number of elements utilized.
- the amount of detectors involved, and the electrical system that processes and analyzes the positional information furnished by the optical elements are relatively expensive and complex.
- the present invention which addresses this need, resides in a detector for determining the position of a light source with respect to the orientation of the light detector.
- the light detector includes a base, a diffusely reflective baffle, and opaque mask, and a plurality of light sensors.
- the base has a surface formed of a diffusely reflective material.
- the baffle is also formed of a diffusely reflective material and, together with the base, defines a plurality of diffusely reflective regions.
- the opaque mask is spaced a predetermined distance away from the reflective regions by the baffle and it mask occludes a portion of incident light directed toward the reflective regions.
- Each light sensor is associated with a separate reflective region and is responsive to incident light and generates a response signal based on the intensity of light incident on their respective reflective region.
- the reflective regions are formed by four quadrants of a hemispherical cavity.
- the opaque mask has a surface that faces the sensors and that diffusely reflects light toward the sensors.
- a device for determining the incoming direction of incident light comprising a base, a mask, and a baffle.
- the base defines a substantially light reflective surface configured to receive the incident light.
- the mask is situated a predetermined distance-above the surface and has a plurality of light detectors which are each adapted to generate a signal that is indicative of the intensity of incident light received by the detector.
- the baffle assembly situated between the mask and the surface of the base. The baffle has a light reflective surface and, together with the mask and the housing, defines a plurality of separate light receiving quadrants, each of which is occupied by one of the detectors.
- a processor associated with the detectors, for processing signals received from the detectors and generating direction signals that are indicative of the position of the light source.
- the reflective surface of the housing is a diffuse reflector of the Lambertian type.
- the mask is configured and situated such that the cross-sectional area of each detector that receives the light remains substantially constant and there are two detectors.
- each detector is a photodiode.
- the baffle is substantially cross- shaped and thereby forms four quadrants
- FIG. 1 is a perspective view of a quadrant hemispherical light detector, in accordance with the present invention, for determining the direction of incoming light from a light source.
- FIG. 2 is a perspective view of the quadrant hemispherical light detector of FIG. 1, connected to processing electronics and a display.
- FIG. 3 is a cross-sectional view of the quadrant hemispherical light detector taken along the line 3-3 of FIG. 2, with a block diagram showing connection to the processing electronics and display of FIG.2.
- FIG. 4 is a plan view of the quadrant hemispherical light detector of FIGS. 1-3.
- FIG. 5A is a schematic diagram of a mask, baffle and photodiode, in accordance with the present invention, illuminated by light incident at an angle normal to the photodiode's surface.
- FIG. 5B is a schematic diagram of a mask, baffle and photodiode, in accordance with the present invention, illuminated by light incident at a relatively small angle from the normal to the photodiode' s surface.
- FIG. 5C is a schematic diagram of a mask, baffle and photodiode, in accordance with the present invention, illuminated by light incident at a relatively large angle from the normal to the photodiode' s surface.
- FIG. 6 is a graph of the collection efficiency of the quadrant hemispherical light detector of FIGS. 1-4.
- FIG. 7 is a schematic diagram of the electronics for converting electrical signal from the quadrant hemispherical light detector of FIGS. 1-4, to X-Y coordinates for displaying the direction of incoming light on the display.
- FIG. 8 is a cross-sectional view of a quadrant spherical light detector, in accordance with the present invention, for determining the direction of incoming light from a light source from virtually any direction.
- the present invention resides in a quadrant light detector 10 that determines the direction of incoming light 11 from a light source 12 without the need for complicated or expensive photodetector arrays and associated electrical processing systems. More specifically, the quadrant light detector employs the concepts of constructed occlusion and diffuse reflection to improve its response at incident angles near the horizon.
- the quadrant light detector 10 includes a disk-shaped mask 14_ that is situated above a base 15 having, formed in its upper flat surface, a hemispherical cavity 16.
- the hemispherical cavity is surrounded by a flat ring-shaped shoulder 18 and divided into four separate quadrants 20, 22, 24 and 26 by a baffle assembly 28.
- the mask, base cavity, and baffle assembly are all formed of a suitable diffuse reflective material such as Spectralon ® .
- Spectralon ® is a highly reflective polymeric block material manufactured and sold by Labsphere Inc., of North Sutton, New Hampshire.
- Spectralon ® is easily machined, very durable, and provides a highly efficient Lambertion surface having a reflectivity of over 99%, in visible or near-infrared wavelengths.
- a Lambertian reflective surface reflects light with a substantially uniform intensity in all directions.
- the mask, the base cavity, and/or the baffle assembly could be constructed of a suitable base material of, for example, aluminum or plastic with the reflective surfaces coated with a diffuse reflective material such as barium sulfate.
- the four separate light receiving quadrants 20, 22, 24 and 26, capture incident light 11 and the captured light intensity within a given quadrant depends on the angle of incidence of the incoming light, as well as the incoming light's overall intensity at any point in time.
- a significant function of the hemispherical cavity 16 is to provide a diffusely reflective surface that averages the incoming light at the cavity's aperture 30 and a hemispherical shape is preferred because of its azimuthal symmetry and for its ease in construction. However, other cavity shapes are acceptable. For purposes of describing the light detector's operation, a good approximation is obtained by treating the cavity as if it were a diffusely reflective flat surface that averages the incident light in the plane of• the cavity's aperture.
- a photodiode 32, 34, 36 and 38 is associated with each quadrant of the hemispherical cavity. Each photodiode generates an electrical signal based on the light intensity in the respective quadrant of the cavity 16.
- the photodiodes are all a commercially available photodiode (PIN-040A) sold by United Detector Technologies (UDT) Sensors, Inc., of Hawthorne, California. Each photodiode has a responsive area of 0.8 square millimeters and a noise equivalent power (NEP) of 6 x 10' 15 Watts/ (Hertz) 05 .
- NEP noise equivalent power
- Such a photodiode with a relatively small responsive area has two significant advantages one is it generally has low noise characteristics.
- the quadrant light detector's efficiency nears its asymptotic state with a hemisphere having a 1 inch diameter.
- the walls baffle assembly 28 have a thickness of 3 millimeters, which is also sufficient for small holes to be bored through the baffles to accommodate small signal wires 40 that allow for electrical connection to the photodiodes from the base 15.
- the baffles may be constructed of Spectralon ® doped with barium sulfate. Further, the reflectivity of the baffles can be graded so that baffle can have an angle dependent reflectively, if needed to compensate other nonuniform effects.
- the mask 14 is of circular cross-section and is composed of an opaque material, and advantageously has a diffusely reflective or Lambertian outer surface.
- a transparent dome 20 made from a suitable material such --as Pyrex ® , encloses the mask, baffle assembly, photodiodes and base's upper side.
- the ratio between the mask's diameter and the aperture's diameter, and the distance between the mask 14 and the aperture 30, are the most significant parameters in optimizing the quadrant light detector's accuracy and response efficiency. A more accurate response is obtained as the mask/aperture diameter ratio approaches one. However, the detector's response efficiency or sensitivity decreases as the mask/aperture diameter ratio approaches one because the aperture's acceptance area necessarily decreases.
- the mask's diameter is 1.8 inches and the aperture's diameter is 2.0 inches, which results in a mask/aperture diameter ratio of approximately 0.9 or 90%.
- a mask/aperture diameter ratio of 0.9 provides a relatively uniform response while maintaining an acceptable sensitivity.
- the disk-shaped mask is spaced away from the aperture by 0.2 to 0.3 inches, which results in a mask distance to aperture diameter ratio of approximately 0.1 or 10% to 0.15 or 15%.
- the light detector 10 takes advantage of a technique called constructed occlusion to reduce the cosine dependence of the detector's response.
- the mask's diameter is slightly less than the aperture's diameter.
- the cross-sectional width of the light in the first region decreases by A ⁇
- the cross-sectional width of the light in the second region increases by A ⁇ (FIG. 5B) . Accordingly, as long as a portion of the mask's shadow remains on the photodiode, the decreasing incident light in the first region is compensated by the increasing incident light in the second region, so that the combined or total cross-sectional width of incident light in both regions on the aperture remains at approximately Ag. More specifically, as the angle of incident light increases even further from the normal direction, the first region eventually disappears and the occluded region, or the region under the mask's shadow decreases as it moves off the aperture, causing the second region to further increase.
- the increasing second region nearly compensates for the cosine effect as the mask's shadow moves off the aperture.
- the total captured incident light remains nearly constant for all incident light angles except at angles near the horizon or nearly parallel with the plane of the aperture.
- the constructed occlusion effect of the mask ceases and, accordingly, the cross-sectional width of the incident light on the aperture is again cosine dependent.
- the aperture's cosine dependent cross-sectional width for angles near the horizon is compensated by the baffle assembly 28. As shown in FIG.
- baffles generally restrict the incident light to the quadrant that it enters as the incident light passes through the aperture.
- pianar baffle walls are generally desired, the baffles could conceivably have curved walls.
- the baffle assembly allow detection of light incident at angles near the horizon by intercepting it and diffusely reflecting it toward the mask 14 and the aperture 30. • • Preferably, the distance between the aperture and the mask is selected such that, for light incident at angles near the horizon, the cross-sectional area of the baffle assembly is nearly equal to the nonoccluded region or area A, of the aperture, defined when light is incident at angles near to normal direction.
- the base's shoulder 18 improves the forward sensitivity of the light detector 10 and reduces its sensitivity to light incoming from below the horizon.
- the shoulder diffusely reflects light incoming from above the horizon some of it reaches the mask 14, and eventually, the photodiodes, and the shoulder blocks incoming light from below the horizon that would otherwise reach the mask and/or photodiode in the shoulder's absence.
- the collection efficiency of the quadrant light detector of the present invention is shown in FIG. 6.
- the accuracy of the quadrant light detector's direction response can be empirically optimized using a variety of parameters.
- the height, relative diameter, thickness, and reflectivity of the mask 14, the width and reflectivity of the shoulders 18, the height and reflectivity of the baffle assembly 28, the shape and reflectivity of the cavity 16, and the photodiode's diameter all affect the light detector's directional response.
- the detector's direction response can be tailored to be nonuniform, if desired, by varying specific parameters. For example, decreasing the distance between the mask and the aperture will decrease the spherical sector of the detectors response, while increasing the detector's efficiency.
- the detector's efficiency improves to about 90%, compared to about 40% with a mask above the aperture (FIG. 6) , but its response sector is narrowed. Further, the light detector's spectral response can be tailored by using spectrally selective paint -on the diffusely reflective surfaces.
- the incoming direction of the incident light is determined by the processing circuit 48 shown in FIG. 6.
- the circuit is equivalent to the circuit suggested by UDT Sensors for use with its quad-cell photodiodes.
- the quadrants are labeled A-D, in clockwise order starting with the upper left-hand quadrant.
- the cathodes of the photodiodes are all connected to a common ground terminal.
- the anodes of the respective photodiodes are each connected to the respective current-to-voltage amplifier 50.
- the voltages are then summed and/or subtracted by one of three amplifiers 52, 54 and 56.
- the first amplifier 52 outputs a signal which is the sum of the signals from all four quadrants, A-D.
- the second amplifier 54 sums the signals from the left quadrants, A and D, and subtracts the sum of the signals from the right quadrants, B and C.
- the second amplifier's output signal is then divided by the first amplifier's output signal by a divider 58 that provides and X output signal.
- a third amplifier 56 sums the signals from the upper quadrants, A and B, and subtracts the sum of the signals from the lower quadrants, C and D.
- the third amplifier's output signal is then divided by the first amplifier's output signal by a divider 60 that provides a Y output signal.
- a suitable divider is the DIVIO0 manufactured and sold by Burr-Brown ® of Arlington, Arizona.
- the X and Y output signals can then be connected to a suitable display 62, such as an oscilloscope (FIGS. 2 and 3) .
- the X output signal is connected to the oscilloscope's horizontal sweep input terminal and the Y output signal is connected to the oscilloscope's vertical sweep input terminal.
- the oscilloscope's spot 64 indicates the azimuth and elevation of the incoming light.
- the direction for the incident light associated with the spot indicated on the display (FIG. 2) is an azimuth of about 45 degrees and an elevation of about 45 degrees.
- the azimuth (Az) taking into account the appropriate quadrant, can be calculated from the X and Y output signals using the following formula:
- the elevation is related to the radial distance from, in this example, the center of the oscilloscope 62 and the spot 64. This radial distance or length is calculated from the X and Y output signals using the following formula:
- FIG. 8 Another embodiment of the quadrant light detector 10 of the present invention is shown in FIG. 8. This embodiment is formed by placing two quadrant hemispherical light detectors 10, such as those shown in FIGS. 1-4, back-to-back, to provide full spherical coverage.
- the quadrant light detector 10 of the present invention provides a relatively simple and cost effective device that can determine the incoming direction of incident light from virtually any direction within a hemisphere or a sphere without a large number of optical elements or complex processing electronics.
- Azimuth ATAN(y/x) * 180/PI()+ IF(x ⁇ 0,180,0)+IF(AND(x>0,y ⁇ 0),360,0)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU22423/97A AU2242397A (en) | 1996-01-23 | 1997-01-22 | Quadrant light detector |
JP53749997A JP2001514736A (en) | 1996-01-23 | 1997-01-22 | Quadrant detector |
EP97905575A EP0876586A4 (en) | 1996-01-23 | 1997-01-22 | Quadrant light detector |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/589,104 | 1996-01-23 | ||
US08/589,104 US5705804A (en) | 1996-01-23 | 1996-01-23 | Quadrant light detector |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997044638A1 true WO1997044638A1 (en) | 1997-11-27 |
Family
ID=24356609
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1997/000555 WO1997044638A1 (en) | 1996-01-23 | 1997-01-22 | Quadrant light detector |
Country Status (6)
Country | Link |
---|---|
US (2) | US5705804A (en) |
EP (1) | EP0876586A4 (en) |
JP (1) | JP2001514736A (en) |
AU (1) | AU2242397A (en) |
CA (1) | CA2244157A1 (en) |
WO (1) | WO1997044638A1 (en) |
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Also Published As
Publication number | Publication date |
---|---|
US5705804A (en) | 1998-01-06 |
CA2244157A1 (en) | 1997-11-27 |
EP0876586A4 (en) | 2000-01-19 |
US5877490A (en) | 1999-03-02 |
JP2001514736A (en) | 2001-09-11 |
AU2242397A (en) | 1997-12-09 |
EP0876586A1 (en) | 1998-11-11 |
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