GB1499593A - Electrical remote sensing system - Google Patents

Electrical remote sensing system

Info

Publication number
GB1499593A
GB1499593A GB1369375A GB1369375A GB1499593A GB 1499593 A GB1499593 A GB 1499593A GB 1369375 A GB1369375 A GB 1369375A GB 1369375 A GB1369375 A GB 1369375A GB 1499593 A GB1499593 A GB 1499593A
Authority
GB
United Kingdom
Prior art keywords
frequency
regulator
voltage
unit
controls
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.)
Expired
Application number
GB1369375A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CROWCON Ltd
Original Assignee
CROWCON Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by CROWCON Ltd filed Critical CROWCON Ltd
Priority to GB1369375A priority Critical patent/GB1499593A/en
Publication of GB1499593A publication Critical patent/GB1499593A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems
    • G08C19/16—Electric signal transmission systems in which transmission is by pulses
    • G08C19/26—Electric signal transmission systems in which transmission is by pulses by varying pulse repetition frequency

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

1499593 Measuring voltage CROWCON (INSTRUMENTS) Ltd 29 March 1976 [3 April 1975] 13693/75 Heading G1U In monitoring a parameter (e.g. gas concentration) at a remote location a unit is provided at the location which controls the frequency of an oscillator therein, the oscillator providing the drive signal for a 'switched mode' regulator whose stabilized output powers the unit, the unit being connected to a central station over power supply cable, and the ripple frequency thereon is measured at that station to determine the parameter. The regulator R supplies a stabilized voltage to the sensor bridge B whose output voltage controls the frequency of an oscillator VCO which provides a triangular waveform to a regulator control circuit. The stabilized voltage is compared with a Zener diode reference voltage in the control, and the difference is compared to the triangular waveform to provide a pulse-train whose mark/space ratio controls the regulator output voltage. Due to the switching action of the regulator, a ripple frequency appears on the unregulated supply from the cable link, the frequency being representative of the bridge output. At the central station, Fig. 3 (not shown), this frequency is filtered out and measured.
GB1369375A 1976-03-29 1976-03-29 Electrical remote sensing system Expired GB1499593A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1369375A GB1499593A (en) 1976-03-29 1976-03-29 Electrical remote sensing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1369375A GB1499593A (en) 1976-03-29 1976-03-29 Electrical remote sensing system

Publications (1)

Publication Number Publication Date
GB1499593A true GB1499593A (en) 1978-02-01

Family

ID=10027675

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1369375A Expired GB1499593A (en) 1976-03-29 1976-03-29 Electrical remote sensing system

Country Status (1)

Country Link
GB (1) GB1499593A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1712882B1 (en) * 2005-04-13 2011-07-13 Somfy SAS Autonomous home sensor and installation comprising said sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1712882B1 (en) * 2005-04-13 2011-07-13 Somfy SAS Autonomous home sensor and installation comprising said sensor

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee