Externally-mounted utility meter reading arrangement

• US 5,406,075 A
• Filed: 04/20/1993
• Issued: 04/11/1995
• Est. Priority Date: 08/21/1991
• Status: Expired due to Fees

• Current Assignee: GPT Ltd.
• Original Assignee: GPT Ltd.
• Inventors: Pettenden, Stephen C.
• Primary Examiner(s): Nelms, David C.
• Application Number:
  US08/039,379
• Time in Patent Office: 721 Days
• Field of Search: 250/227.21, 250/231.11, 250/231.13, 250/231.14, 250/231.15, 250/231.16, 250/231.17, 250/237 G
• US Class Current: 250/227.21
• CPC Class Codes: G01D 4/008 Modifications to installed utility meters to enable remote reading
• CPC Class Codes: G01R 22/00 Arrangements for measuring time integral of electric power or current, e.g. electricity meters
• CPC Class Codes: G06M 1/272 using photoelectric means
• CPC Class Codes: G08C 23/06 through light guides, e.g. optical fibres
• CPC Class Codes: Y02B 90/20 Smart grids as enabling technology in buildings sector smart grids supporting the management or operation of end-user stationary applications in general, or like technologies with no associated climate change mitigation effect Y04S20/00
• CPC Class Codes: Y04S 20/30 Smart metering, e.g. specially adapted for remote reading

Abstract

A meter reading arrangement has an optical fiber transmission path made up of a pair of optical fibers connecting between a meter to be read and a meter interface unit. Light is transmitted over one of the fibers to an indicator on the meter and reflected light is transmitted by the second fiber to a transducer in the interface unit.

Claims

1. A meter reading arrangement mounted eternally to a meter, comprises:

means for directing light at a fastest moving indicator on the meter for reflection from the indicator; and

an optical fibre transmission path for linking the meter to a remotely located meter interface unit, one end of the transmission path being directed at the fastest moving indicator and the other end onto transducer means at the interface unit, each variation in light level reflected from the indicator being transmitted to the interface unit for processing.

2. An arrangement as claimed in claim 1 and including a second fibre optical transmission path over which light is directed from a remote source onto the indicator for reflection to the interface unit.

3. An arrangement a claimed in claim 1 in which focusing means are provided adjacent the meter for focusing transmitted and/or reflected light.

4. An arrangement as claimed in claim 1, wherein the transducer means is operative for sensing each sequential variation in the amplitude of reflected transmitted light.

5. An arrangement as claimed in claim 1, wherein the meter interface unit connects light from a plurality of meters remotely situated from the interface unit and from each other, each meter being monitored over a separate optical path, and integrates all the information provided by the variations in light levels, for further onward transmission via onward transmission means to another location for interpretation.

6. An arrangement as claimed in claim 5 wherein the onward transmission means includes, coaxial cables, telephone lines, radio or main carrier transmission over power cables.

7. An arrangement as claimed in claim 1 wherein the light is modulated.

8. An arrangement as claimed in claim 7 wherein the modulated light is mono chromatic.

9. An arrangement as claimed in claim 1 wherein the indicator is a rotating member.

10. An arrangement as claimed in claim 9 in which the member is a Ferraris disk having markings on at least one of its edge and face.

11. An arrangement as claimed in claim 9 in which the member is a test dial where a pointer rotates and intercepts the light.

12. An arrangement as claimed in claim 9 in which the member is a barrel counter where the light is directed at the least significant digit.

13. An arrangement as claimed in claim 3, and sealing means for securing the end of the optical fibre transmission path to at least one of the meter and the focusing means.

14. An arrangement as claimed in claim 3 in which the focusing means includes a prism and a lens associated therewith.

15. A meter reading arrangement as claimed in claim 3 in which the focusing means includes mirror means.