CA2271596A1 - Electricity meter - Google Patents
Electricity meter Download PDFInfo
- Publication number
- CA2271596A1 CA2271596A1 CA002271596A CA2271596A CA2271596A1 CA 2271596 A1 CA2271596 A1 CA 2271596A1 CA 002271596 A CA002271596 A CA 002271596A CA 2271596 A CA2271596 A CA 2271596A CA 2271596 A1 CA2271596 A1 CA 2271596A1
- Authority
- CA
- Canada
- Prior art keywords
- light
- meter
- light source
- receiver
- light receiver
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/133—Arrangements for measuring electric power or power factor by using digital technique
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
- G01R11/02—Constructional details
-
- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
- G08C19/36—Electric signal transmission systems using optical means to covert the input signal
Abstract
A meter for measuring electricity usage for a given load includes a housing and two light sources disposed in the housing and configured to output light at a predetermined frequency. Two light receivers are disposed in the housing so that a light path is defined between each light source and its respective light receiver. Each light receiver is configured to receive the light from its light source and to output a signal responsively thereto. A rotatable member is disposed in the housing in the light paths and is rotatable responsively to the electricity usage. The member has a first portion and a second portion. The first portion transmits incident light while the second portion blocks light. The first portion and the second portion are defined on the member so that the member modulates the light as it rotates. A
filter circuit in communication with the light receiver is configured to receive the output signal from the light receiver and to detect therefrom modulation of the light by the rotatable member.
filter circuit in communication with the light receiver is configured to receive the output signal from the light receiver and to detect therefrom modulation of the light by the rotatable member.
Claims (16)
1. A meter for measuring electricity usage for a given load, said meter comprising:
a housing;
a first light source and a second light source, each said light source disposed in said housing and configured to output light at a predetermined frequency;
a first light receiver and a second light receiver, wherein each said light receiver is disposed in said housing so that a first light path is defined between said first light source and said first light receiver and so that a second light path is defined between said second light source and said second light receiver, and wherein each said light receiver is configured to receive said light from its respective said light source and to output a signal responsively thereto at a frequency related to said predetermined frequency by a predetermined relationship;
a rotatable member disposed in said housing and being rotatable responsively to said electricity usage, said rotatable member defining a first portion and a second portion so that said first portion and said second portion alternatingly intercept each of said first light path and said second light path as said rotatable member rotates, wherein said first portion transmits incident light from a said light source to its respective said light receiver and wherein said second portion blocks said incident light, and wherein one of said first portion and said second portion is defined on said rotatable member so that said one of said first and second portions can intercept only one of said first light path and said second light path at a time; and a filter circuit including two band pass filters, each in communication with a respective one of said first light receiver and said second light receiver, wherein each said band pass filter receives said output signal from its said respective light receiver and passes a frequency range that includes said related frequency so that said band pass filter outputs a signal at said related frequency upon receipt of said light receiver output signal, two acquisition circuits, each in communication with a respective one of said band pass filters, wherein each said acquisition circuit receives said output signal from its said respective band pass filter and is configured to output responsively thereto a signal having a magnitude based on the magnitude of said band pass filter output signal, and two comparator circuits, each in communication with a respective one of said acquisition circuits, wherein each said comparator circuit receives said output signal from its said respective acquisition circuit and is configured to compare said acquisition circuit output signal with a threshold voltage and output a signal in one of two states depending on said comparison.
a housing;
a first light source and a second light source, each said light source disposed in said housing and configured to output light at a predetermined frequency;
a first light receiver and a second light receiver, wherein each said light receiver is disposed in said housing so that a first light path is defined between said first light source and said first light receiver and so that a second light path is defined between said second light source and said second light receiver, and wherein each said light receiver is configured to receive said light from its respective said light source and to output a signal responsively thereto at a frequency related to said predetermined frequency by a predetermined relationship;
a rotatable member disposed in said housing and being rotatable responsively to said electricity usage, said rotatable member defining a first portion and a second portion so that said first portion and said second portion alternatingly intercept each of said first light path and said second light path as said rotatable member rotates, wherein said first portion transmits incident light from a said light source to its respective said light receiver and wherein said second portion blocks said incident light, and wherein one of said first portion and said second portion is defined on said rotatable member so that said one of said first and second portions can intercept only one of said first light path and said second light path at a time; and a filter circuit including two band pass filters, each in communication with a respective one of said first light receiver and said second light receiver, wherein each said band pass filter receives said output signal from its said respective light receiver and passes a frequency range that includes said related frequency so that said band pass filter outputs a signal at said related frequency upon receipt of said light receiver output signal, two acquisition circuits, each in communication with a respective one of said band pass filters, wherein each said acquisition circuit receives said output signal from its said respective band pass filter and is configured to output responsively thereto a signal having a magnitude based on the magnitude of said band pass filter output signal, and two comparator circuits, each in communication with a respective one of said acquisition circuits, wherein each said comparator circuit receives said output signal from its said respective acquisition circuit and is configured to compare said acquisition circuit output signal with a threshold voltage and output a signal in one of two states depending on said comparison.
2. The meter as in claim 1, wherein said rotatable member is a disk.
3. The meter as in claim 2, wherein said first point and said second point are angularly offset from each other with respect to the axis of said disk, and wherein one of said first portion and said second portion has an angular width at a first arc defined by a radius extending from said axis to said first point and at a second arc defined by a radius extending from said axis to said second point less than the angular distance between said first point and said second point.
4. The meter as in claim 3, wherein said first arc and said second arc are the same.
5. The meter as in claim 1, wherein said first portion reflects said incident light.
6. The meter as in claim 1, wherein said first portion is transparent to said incident light.
7. The meter as in claim 1, wherein said second portion is transparent to said incident light.
8. The meter as in claim 1, wherein said second portion absorbs said incident light.
9. The meter as in claim 1, wherein said second portion reflects said incident light.
10. The meter as in claim 3, wherein said one of said first portion and said second portion defines an angular width at said first arc and at said second arc at least approximately 20°.
11. The meter as in claim 10, wherein said one of said first portion and said second portion defines an angular width at said first arc and at said second arc of approximately 24°.
12. The meter as in claim 5, wherein said rotatable member is a disk, wherein said first and second light sources and said first and second light receivers are disposed on the same side of a plane defined by said disk, and wherein said second portion is non-reflective to said incident light.
13. The meter as in claim 6, wherein said rotatable member is a disk, wherein each said light source and its respective said light receiver are disposed on opposite sides of a plane defined by said disk, wherein said first portion comprises at least one hole defined by said disk, and wherein said second portion comprises a solid, nontransparent section of said disk.
14. The meter as in claim 1, wherein each of said first light source and said second light source includes an infrared light emitting diode and a circuit configured to drive said diode at said predetermined frequency.
15. The meter as in claim 1, wherein each said light source outputs said light having a frequency of approximately 8 kHz.
16. The meter as in claim 1, wherein each said light receiver includes a photo-transistor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/172,822 US6232885B1 (en) | 1998-10-15 | 1998-10-15 | Electricity meter |
| US09/172,822 | 1998-10-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2271596A1 true CA2271596A1 (en) | 2000-04-15 |
| CA2271596C CA2271596C (en) | 2010-10-05 |
Family
ID=22629381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2271596A Expired - Lifetime CA2271596C (en) | 1998-10-15 | 1999-05-13 | Electricity meter |
Country Status (3)
| Country | Link |
|---|---|
| US (2) | US6232885B1 (en) |
| BR (1) | BR9902238A (en) |
| CA (1) | CA2271596C (en) |
Families Citing this family (26)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6150955A (en) * | 1996-10-28 | 2000-11-21 | Tracy Corporation Ii | Apparatus and method for transmitting data via a digital control channel of a digital wireless network |
| US6232885B1 (en) * | 1998-10-15 | 2001-05-15 | Schlumberger Resource Management Services, Inc. | Electricity meter |
| US6424270B1 (en) | 1998-10-30 | 2002-07-23 | Schlumberger Resource Management Services, Inc. | Utility meter interface unit |
| US6784807B2 (en) * | 2001-02-09 | 2004-08-31 | Statsignal Systems, Inc. | System and method for accurate reading of rotating disk |
| US6998601B2 (en) * | 2002-04-11 | 2006-02-14 | Agilent Technologies, Inc. | Dual-axis optical encoder device |
| US7135986B2 (en) * | 2003-06-13 | 2006-11-14 | Arad Measuring Technologies Ltd. | Meter register having an encoder for measuring material flow and an algorithm to selectively block signal transmission |
| US7267014B2 (en) * | 2004-09-23 | 2007-09-11 | Arad Measuring Technologies Ltd. | Meter register having an encoder |
| US8312103B2 (en) | 2006-08-31 | 2012-11-13 | Itron, Inc. | Periodic balanced communication node and server assignment |
| US8024724B2 (en) * | 2006-08-31 | 2011-09-20 | Itron, Inc. | Firmware download |
| US7847536B2 (en) | 2006-08-31 | 2010-12-07 | Itron, Inc. | Hall sensor with temperature drift control |
| US8049642B2 (en) | 2006-09-05 | 2011-11-01 | Itron, Inc. | Load side voltage sensing for AMI metrology |
| US7843391B2 (en) | 2006-09-15 | 2010-11-30 | Itron, Inc. | RF local area network antenna design |
| US8787210B2 (en) | 2006-09-15 | 2014-07-22 | Itron, Inc. | Firmware download with adaptive lost packet recovery |
| US9354083B2 (en) * | 2006-09-15 | 2016-05-31 | Itron, Inc. | Home area networking (HAN) with low power considerations for battery devices |
| US7965758B2 (en) * | 2006-09-15 | 2011-06-21 | Itron, Inc. | Cell isolation through quasi-orthogonal sequences in a frequency hopping network |
| US8055461B2 (en) | 2006-09-15 | 2011-11-08 | Itron, Inc. | Distributing metering responses for load balancing an AMR network |
| US8138944B2 (en) | 2006-09-15 | 2012-03-20 | Itron, Inc. | Home area networking (HAN) with handheld for diagnostics |
| US8212687B2 (en) | 2006-09-15 | 2012-07-03 | Itron, Inc. | Load side voltage sensing for AMI metrology |
| US8384558B2 (en) * | 2006-10-19 | 2013-02-26 | Itron, Inc. | Extending contact life in remote disconnect applications |
| US7821776B2 (en) * | 2008-03-25 | 2010-10-26 | Elster Electricity, Llc | Tamper resistant meter assembly |
| CN102279312B (en) * | 2011-07-06 | 2016-04-06 | 保定市三川电气有限责任公司 | A kind of method and apparatus common electric energy meter being transformed into intelligent electric meter |
| US10200476B2 (en) | 2011-10-18 | 2019-02-05 | Itron, Inc. | Traffic management and remote configuration in a gateway-based network |
| US9419888B2 (en) | 2011-12-22 | 2016-08-16 | Itron, Inc. | Cell router failure detection in a mesh network |
| TWI437237B (en) * | 2012-01-18 | 2014-05-11 | Wistron Neweb Corp | Meter apparatus, metering network, and metering method thereof |
| US9109922B2 (en) | 2013-07-11 | 2015-08-18 | Honeywell International Inc. | Magnetically-impervious retrofit kit for a metered-commodity consumption meter |
| US10833799B2 (en) | 2018-05-31 | 2020-11-10 | Itron Global Sarl | Message correction and dynamic correction adjustment for communication systems |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4034292A (en) * | 1976-02-18 | 1977-07-05 | Westinghouse Electric Corporation | Direction sensitive opto-electronic pulse initiator for electrical meters |
| US4327362A (en) | 1978-10-23 | 1982-04-27 | Rockwell International Corporation | Meter rotor rotation optical sensor |
| JPS57182809A (en) * | 1981-05-06 | 1982-11-10 | Toyota Motor Corp | Positioning controller |
| US4489384A (en) | 1982-03-01 | 1984-12-18 | Mcgraw-Edison Company | Electro-optical sensor for watt-hour meter |
| US4678907A (en) | 1984-06-21 | 1987-07-07 | Microtel Limited | Optical scanner and sensor for monitoring power consumption |
| US4680704A (en) | 1984-12-28 | 1987-07-14 | Telemeter Corporation | Optical sensor apparatus and method for remotely monitoring a utility meter or the like |
| US4646084A (en) | 1985-06-21 | 1987-02-24 | Energy Innovations, Inc. | Meter reading methods and apparatus |
| US5014213A (en) * | 1988-04-20 | 1991-05-07 | Domestic Automation Company, Inc. | System for use with polyphase utility meters for recording time of energy use |
| CA1314590C (en) | 1989-02-15 | 1993-03-16 | Benoit Allard | Reading device for a watt-hour meter |
| US5214587A (en) | 1990-11-28 | 1993-05-25 | Green Richard G | Device for monitoring utility usage |
| US5442281A (en) | 1993-06-01 | 1995-08-15 | Enscan, Inc. | Method and apparatus for deriving power consumption information from the angular motion of a rotating disk in a watt hour meter |
| US5506404A (en) | 1993-09-08 | 1996-04-09 | Milan-Kamski; W. J. | Retrofitting device providing automatic reading capability for metering systems |
| US5874731A (en) * | 1995-03-20 | 1999-02-23 | Schlumberger Industries, Inc. | Ambient light filter |
| US5767790A (en) * | 1996-03-07 | 1998-06-16 | Jovellana; Bartolome D. | Automatic utility meter monitor |
| US6232885B1 (en) * | 1998-10-15 | 2001-05-15 | Schlumberger Resource Management Services, Inc. | Electricity meter |
-
1998
- 1998-10-15 US US09/172,822 patent/US6232885B1/en not_active Expired - Lifetime
-
1999
- 1999-05-13 CA CA2271596A patent/CA2271596C/en not_active Expired - Lifetime
- 1999-06-11 BR BR9902238-9A patent/BR9902238A/en not_active IP Right Cessation
-
2001
- 2001-05-14 US US09/855,185 patent/US6617978B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| BR9902238A (en) | 2000-05-30 |
| US20010052859A1 (en) | 2001-12-20 |
| US6617978B2 (en) | 2003-09-09 |
| US6232885B1 (en) | 2001-05-15 |
| CA2271596C (en) | 2010-10-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20190513 |