GB1425456A - Method and apparatus for monitoring electromagnetic radiation - Google Patents

Method and apparatus for monitoring electromagnetic radiation

Info

Publication number
GB1425456A
GB1425456A GB4410172A GB4410172A GB1425456A GB 1425456 A GB1425456 A GB 1425456A GB 4410172 A GB4410172 A GB 4410172A GB 4410172 A GB4410172 A GB 4410172A GB 1425456 A GB1425456 A GB 1425456A
Authority
GB
United Kingdom
Prior art keywords
relay
switch
amplifier
hysteresis
circuit
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
GB4410172A
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.)
Clarke Chapman Group Ltd
Original Assignee
Clarke Chapman Group 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 Clarke Chapman Group Ltd filed Critical Clarke Chapman Group Ltd
Priority to GB4410172A priority Critical patent/GB1425456A/en
Publication of GB1425456A publication Critical patent/GB1425456A/en
Expired legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/08—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements
    • F23N5/082—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using light-sensitive elements using electronic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
    • G01J1/44—Electric circuits
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
    • G01T7/00—Details of radiation-measuring instruments
    • G01T7/12—Provision for actuation of an alarm
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2229/00—Flame sensors
    • F23N2229/22—Flame sensors the sensor's sensitivity being variable

Landscapes

  • Engineering & Computer Science (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Molecular Biology (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)

Abstract

1425456 Switching circuits with hysteresis CLARKE CHAPMAN Ltd 13 Sept 1973 [23 Sept 1972] 44101/72 Heading H3T [Also in Division G1] The intensity of radiation, e.g. from a flame is monitored by a semi-conductor detector whose circuit includes a trigger circuit having an adjustable hysteresis feedback loop. As shown, a phototransistor Tr1 feeds amplifier A1 and trigger circuit formed of transistors Tr2, Tr3. An increase in detected radiation causes the current via R6 to make point B positive and switch on Tr2. This causes Tr3 to switch off, resulting in energization of the relay RL1 and a feedback voltage to be applied via set hysteresis potentiometer VR3, such that for switch off of the relay, the amplifier A1 output must fall somewhat below the switch on level for the trigger. R7 provides fixed hysteresis, VR2 sets the switch on lead, VR1 sets the gain for amplifier A1. Amplifier feedback circuit may be modified Fig. 2 (not shown) to provide a variable time delay, so that the relay is held energized in the presence of flame flicker. The effects of longer term (25-30 seconds) fluctuations of intensity may be obviated by providing a variable delay in the relay circuit, Fig. 3 (not shown). The operation of the relay may control fuel valve closure or an alarm. The relay may be substituted by thyristors.
GB4410172A 1972-09-23 1972-09-23 Method and apparatus for monitoring electromagnetic radiation Expired GB1425456A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4410172A GB1425456A (en) 1972-09-23 1972-09-23 Method and apparatus for monitoring electromagnetic radiation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4410172A GB1425456A (en) 1972-09-23 1972-09-23 Method and apparatus for monitoring electromagnetic radiation

Publications (1)

Publication Number Publication Date
GB1425456A true GB1425456A (en) 1976-02-18

Family

ID=10431795

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4410172A Expired GB1425456A (en) 1972-09-23 1972-09-23 Method and apparatus for monitoring electromagnetic radiation

Country Status (1)

Country Link
GB (1) GB1425456A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2131743A (en) * 1979-12-26 1984-06-27 Pitney Bowes Inc Postage meter
WO2000052389A1 (en) * 1999-03-02 2000-09-08 Satronic Ag Device for monitoring the flames of oil burners, with adaptive properties

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2131743A (en) * 1979-12-26 1984-06-27 Pitney Bowes Inc Postage meter
WO2000052389A1 (en) * 1999-03-02 2000-09-08 Satronic Ag Device for monitoring the flames of oil burners, with adaptive properties

Similar Documents

Publication Publication Date Title
GB906852A (en) Electrical control system
GB1174899A (en) Improvements relating to Controllable Rectifier Devices
GB692802A (en) Improvements in or relating to electric trigger circuits
US4000961A (en) Primary flame safeguard system
GB1252536A (en)
GB1294607A (en) An automatic trigger level control circuit
GB1425456A (en) Method and apparatus for monitoring electromagnetic radiation
GB1278991A (en) Pulsed power supply for electric arc welding
GB1109587A (en) Improvements in or relating to ionization smoke detectors
GB1083153A (en) Improved system for controlling a motor
SE330659B (en)
GB918590A (en) Yarn slub detector
US2064192A (en) Protective circuit
GB1210099A (en) Improvements relating to welding power sources
CA1049112A (en) Alarm control device
GB1082973A (en) Electrical interrupted-beam alarm systems
GB1199855A (en) Direct Current Arc Welding Device
US3020868A (en) Torpedo steering system
GB1423510A (en) Overload protection devices
GB1270388A (en) Improvements in or relating to detectors of smoke and the like
GB1289134A (en)
GB1602817A (en) Smoke detector with means for increasing the sensitivity
JPS56143738A (en) Automatic gain controlling system of light receiver
SU667984A1 (en) Fire alarm
JPS6421606A (en) Adaptive loop control system

Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee