GB1302380A - - Google Patents

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Publication number
GB1302380A
GB1302380A GB1302380DA GB1302380A GB 1302380 A GB1302380 A GB 1302380A GB 1302380D A GB1302380D A GB 1302380DA GB 1302380 A GB1302380 A GB 1302380A
Authority
GB
United Kingdom
Prior art keywords
tube
gas
meter
monostable
fed
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
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 filed Critical
Publication of GB1302380A publication Critical patent/GB1302380A/en
Expired legal-status Critical Current

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Classifications

    • 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
    • G01N29/22—Details, e.g. general constructional or apparatus details
    • G01N29/30—Arrangements for calibrating or comparing, e.g. with standard objects
    • 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
    • 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
    • G01N2291/028—Material parameters
    • G01N2291/02818—Density, viscosity

Landscapes

  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Acoustics & Sound (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)

Abstract

1302380 Sonic gas analysis F C BROOKER 21 Dec 1970 [22 Dec 1969] 62339/69 Heading H4D A method of analysing a gas by comparison with another gas includes comparing the phase displacement of sonic waves propagated through the test gas in a tube or column with the phase displacement of sonic waves propagated through a reference gas in said tube or column, the reference phase displacement being represented by an electrical equivalent circuit. Air containing CO 2 e.g. from glasshouse, public room, tunnel &c. is analysed by being drawn into tube 8 through moisture filler 17 and CO 2 trap 16. Oscillator 1 drives crystal transducer 7 and the propagated sound wave is received by an identical transducer 10. The oscillator output is also fed through a phase shift network 2 to a monostable 4. The transducer 10 output is also fed to a monostable 13. The outputs from monostables 4, 13 are fed to coincidence gate 5 whose output drives a meter 6. The phase shift network is adjusted until the meter reads zero. The tap 15 is changed over to admit contaminated air to the tube wherein the meter will indicate the phase difference between the monostable inputs. Alternatively the phase shift network may include a calibrated variable resistance which is adjusted until the meter reads zero. In either case the calibration may be in ppm. The tube 8 is open to the atmosphere at the far end 11 in order to preserve isobaric conditions for the two measurements. The measurement output signal may be used to actuate an alarm or to control ventilation apparatus.
GB1302380D 1969-12-22 1969-12-22 Expired GB1302380A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6233969 1969-12-22

Publications (1)

Publication Number Publication Date
GB1302380A true GB1302380A (en) 1973-01-10

Family

ID=10488062

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1302380D Expired GB1302380A (en) 1969-12-22 1969-12-22

Country Status (1)

Country Link
GB (1) GB1302380A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4042879A (en) * 1975-11-03 1977-08-16 Rockwell International Corporation Microwave aerosol waterometer
FR2369566A1 (en) * 1976-10-27 1978-05-26 Danfoss As ULTRASONIC APPARATUS INTENDED FOR DETERMINING PHYSICAL QUANTITIES OF A FLUID
US4155246A (en) * 1977-04-13 1979-05-22 Harley E. Schear Rapid gas analyzing system
FR2501864A1 (en) * 1981-03-16 1982-09-17 Atmos Fritzsching & Co Gmbh METHOD AND APPARATUS FOR DETERMINING THE CONCENTRATION OF A CONSTITUENT PART OF A MULTIPLE GAS MIXTURE
US4477771A (en) * 1982-06-21 1984-10-16 General Motors Corporation Microwave detection of soot content in a particulate trap
EP1030176A2 (en) * 1999-02-15 2000-08-23 NGK Spark Plug Company Limited Gas concentration sensor

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4042879A (en) * 1975-11-03 1977-08-16 Rockwell International Corporation Microwave aerosol waterometer
FR2369566A1 (en) * 1976-10-27 1978-05-26 Danfoss As ULTRASONIC APPARATUS INTENDED FOR DETERMINING PHYSICAL QUANTITIES OF A FLUID
US4155246A (en) * 1977-04-13 1979-05-22 Harley E. Schear Rapid gas analyzing system
FR2501864A1 (en) * 1981-03-16 1982-09-17 Atmos Fritzsching & Co Gmbh METHOD AND APPARATUS FOR DETERMINING THE CONCENTRATION OF A CONSTITUENT PART OF A MULTIPLE GAS MIXTURE
US4477771A (en) * 1982-06-21 1984-10-16 General Motors Corporation Microwave detection of soot content in a particulate trap
EP1030176A2 (en) * 1999-02-15 2000-08-23 NGK Spark Plug Company Limited Gas concentration sensor
EP1030176A3 (en) * 1999-02-15 2003-11-05 NGK Spark Plug Company Limited Gas concentration sensor

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Legal Events

Date Code Title Description
PS Patent sealed
PLE Entries relating assignments, transmissions, licences in the register of patents
PLNP Patent lapsed through nonpayment of renewal fees