GB1523231A - Gas detection - Google Patents

Gas detection

Info

Publication number
GB1523231A
GB1523231A GB635576A GB635576A GB1523231A GB 1523231 A GB1523231 A GB 1523231A GB 635576 A GB635576 A GB 635576A GB 635576 A GB635576 A GB 635576A GB 1523231 A GB1523231 A GB 1523231A
Authority
GB
United Kingdom
Prior art keywords
space
feb
transducer
ultrasonic energy
monitoring
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
GB635576A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB635576A priority Critical patent/GB1523231A/en
Priority to GB2546778A priority patent/GB1600079A/en
Publication of GB1523231A publication Critical patent/GB1523231A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B17/00—Fire alarms; Alarms responsive to explosion
    • G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
    • G08B17/117—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means by using a detection device for specific gases, e.g. combustion products, produced by the fire
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/02—Analysing fluids
    • G01N29/024—Analysing fluids by measuring propagation velocity or propagation time of acoustic waves
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/04—Analysing solids
    • G01N29/06—Visualisation of the interior, e.g. acoustic microscopy
    • G01N29/0609—Display arrangements, e.g. colour displays
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
    • G01N29/34—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor
    • G01N29/348—Generating the ultrasonic, sonic or infrasonic waves, e.g. electronic circuits specially adapted therefor with frequency characteristics, e.g. single frequency signals, chirp signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/01—Indexing codes associated with the measuring variable
    • G01N2291/012—Phase angle
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00—Indexing codes associated with group G01N29/00
    • G01N2291/02—Indexing codes associated with the analysed material
    • G01N2291/021—Gases
    • G01N2291/0215—Mixtures of three or more gases, e.g. air

Abstract

1523231 Monitoring gas content ultrasonically R J REDDING 11 Feb 1977 [18 Feb 1976 7 April 1976 1 Dec 1976] 06355/76 14179/76 and 50046/76 Heading G1G The gas content in a space is monitored by energizing a transducer 2 with an audiofrequency modulated electric carrier signal so as to transmit ultrasonic energy through the space, receiving with transducer 4 at least part of the ultrasonic energy transmitted through the space, and monitoring the phase relation between the transmitted audio modulation and the received audio modulation. As shown, a phase-locked loop arrangement is used but, as described with reference to Fig. 6 (not shown), a simple phase comparison may be made. Applications include warning of leaks of dangerous gas from containers. Also temperature and humidity measurements may be made. The transmission path may be shielded, Figs. 3, 4 and 5 (not shown). A plurality of apparatus may be connected to a single processor and are enabled in sequence, the processor being connected to a display which indicates the location of any alarm condition.
GB635576A 1976-02-18 1976-02-18 Gas detection Expired GB1523231A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB635576A GB1523231A (en) 1976-02-18 1976-02-18 Gas detection
GB2546778A GB1600079A (en) 1976-02-18 1978-05-31 Liquid level measuring

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB635576A GB1523231A (en) 1976-02-18 1976-02-18 Gas detection
GB1417976 1976-04-07
GB5004676 1976-12-01

Publications (1)

Publication Number Publication Date
GB1523231A true GB1523231A (en) 1978-08-31

Family

ID=27254812

Family Applications (1)

Application Number Title Priority Date Filing Date
GB635576A Expired GB1523231A (en) 1976-02-18 1976-02-18 Gas detection

Country Status (1)

Country Link
GB (1) GB1523231A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128327A (en) * 1982-09-30 1984-04-26 Us Energy Acoustic velocity measurements in materials using a regenerative method
GB2235294A (en) * 1989-08-23 1991-02-27 Atomic Energy Authority Uk Improvements in acoustic tomography
US5359897A (en) * 1989-08-08 1994-11-01 Front Engineering Ltd. Apparatus for determining the time taken for sound energy to cross a body of fluid in a pipe

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128327A (en) * 1982-09-30 1984-04-26 Us Energy Acoustic velocity measurements in materials using a regenerative method
US5359897A (en) * 1989-08-08 1994-11-01 Front Engineering Ltd. Apparatus for determining the time taken for sound energy to cross a body of fluid in a pipe
GB2235294A (en) * 1989-08-23 1991-02-27 Atomic Energy Authority Uk Improvements in acoustic tomography
GB2235294B (en) * 1989-08-23 1993-12-22 Atomic Energy Authority Uk Improvements in acoustic tomography

Similar Documents

Publication Publication Date Title
ES438681A1 (en) Fire detection system
GB1386223A (en) Ultrasonic microwave doppler intrusion alarm system
ES2113883T3 (en) PERIODIC IMPULSE DISCRIMINATION SYSTEM.
US5019822A (en) Marine object detector
IE42885L (en) Alarm circuit for battery-operated device
GB1454626A (en) Transmitter output monitor for a dvor beacon system
GB1523231A (en) Gas detection
DE3278376D1 (en) A locality supervision system
US3341808A (en) Telemetering apparatus
GB1508245A (en) Moisture indicating apparatus
FR2359554A1 (en) Two condition telephone alarm system - employs low frequency carrier modulated with test frequency to indicate two possible alarm states
ES486395A1 (en) Security system.
JPS5383663A (en) Revolving speed display device of revolving body
GB704779A (en) Improvements in and relating to intruder-operated alarm devices
GB1027885A (en) Improvements relating to apparatus for indicating the departure of a variable quantity from a datum value
JPS52129218A (en) Fault test system of tdma terminal station
JPS5373019A (en) Signal detection system
EP0194085A3 (en) Tone detector with pseudo phase locked loop
JPS5372412A (en) Signal transmission system
JPS5249541A (en) Alarm or indication system for vehicles
FR2356163A1 (en) Channel fault or discontinuity detector - uses two different frequency signals transmitted from opposite ends of channel and detector sensing signal issuing from discontinuity
JPS5341744A (en) Anomalousness detector for transmission signal
JPS5782772A (en) Collision detector
JPS55159164A (en) Detector of cable fault point
GB1004615A (en) Improvements in or relating to moving object detection systems

Legal Events

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