DE3525774A1 - Method for stabilising semiconductor gas sensors by increasing the pollutant concentrations, preferably for motor vehicles - Google Patents

Method for stabilising semiconductor gas sensors by increasing the pollutant concentrations, preferably for motor vehicles

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Publication number
DE3525774A1
DE3525774A1 DE19853525774 DE3525774A DE3525774A1 DE 3525774 A1 DE3525774 A1 DE 3525774A1 DE 19853525774 DE19853525774 DE 19853525774 DE 3525774 A DE3525774 A DE 3525774A DE 3525774 A1 DE3525774 A1 DE 3525774A1
Authority
DE
Germany
Prior art keywords
air
semiconductor gas
sensors
gas sensors
film
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.)
Ceased
Application number
DE19853525774
Other languages
German (de)
Inventor
Heinz Dipl Ing Hoelter
Hanns Ing Grad Rump
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 DE19853525774 priority Critical patent/DE3525774A1/en
Priority to DE8686904172T priority patent/DE3674373D1/en
Priority to AT86904172T priority patent/ATE56824T1/en
Priority to JP50407186A priority patent/JPS63500541A/en
Priority to EP86904172A priority patent/EP0231231B1/en
Priority to PCT/EP1986/000423 priority patent/WO1987000634A1/en
Priority to BR8606799A priority patent/BR8606799A/en
Publication of DE3525774A1 publication Critical patent/DE3525774A1/en
Priority to US07/256,145 priority patent/US4882287A/en
Priority to US07/440,222 priority patent/US5066466A/en
Ceased 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
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
    • G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
    • G01N27/12—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid, for detecting components in the fluid
    • G01N27/122—Circuits particularly adapted therefor, e.g. linearising circuits

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)

Abstract

It is known to use pollutant-sensitive sensors for detecting the air states in a motor vehicle, and, when they respond, to control air intake valves and/or switch filter devices on or off. Known semiconductor gas sensors react not only to pollutants but also, for example, to air humidity, changes in temperature and air speed. The known sensors are provided with plastic films which have a special structure, so that, in the case of one film type, harmless air components can diffuse through while in the case of another film type virtually all gases pass through the film unhindered. In order to make the semiconductor gas sensors employed operate at higher pollutant concentrations and to make the effects caused by air humidity, changes in temperature, air speeds etc. negligibly small, it is proposed according to the invention that the composition of the air to be measured is altered by membrane separation so as to result in increased pollutant concentrations. Thus, for example, harmless components are removed from the gas stream via a film (2), air being fed to the measuring chamber via the pump (4) (figure). <IMAGE>

Description

Es ist bekannt, schadstoffempfindliche Sensoren zur Erfassung der Luftzustände beim Kraftfahrzeug einzusetzen und hierdurch Frischluftklappen zu steuern bzw. Filtergeräte ein- bzw. auszuschalten.It is known sensors sensitive to pollutants to detect the air conditions in the motor vehicle use and thereby fresh air flaps control or switch filter devices on or off.

Weiterhin ist bekannt, daß übliche Halbleitergassensoren nicht nur auf Schadstoffe reagieren, sondern auch auf z. B. Luftfeuchtigkeit, wechselnde Temperaturen und Luftgeschwindigkeit.It is also known that conventional semiconductor gas sensors not only react to pollutants, but also on z. B. humidity, changing temperatures and air speed.

Bei den kleinen, im Straßenverkehr vorkommenden Schadstoffkonzentrationen müssen die den Sensoren nachgeschalteten elektronischen Bauelemente sehr hohe Verstärkungen aufweisen, damit entsprechende Schaltsignale erzeugt werden können, jedoch werden dann zwangsläufig alle unerwünschten Nebeneinflüsse mit verstärkt.For the small ones that occur in road traffic Pollutant concentrations must match the sensors downstream electronic components very much  have high reinforcements, so corresponding Switch signals can be generated, however then inevitably all undesirable side influences with reinforced.

Bei den im Straßenverkehr vorkommenden Schadstoffen handelt es sich zum größten Teil um Gase mit anderen spezifischen Eigenschaften, als die Bestandteile der nicht verunreinigten Luft.With the pollutants occurring in road traffic most of them are gases with others specific properties than the components of the not polluted air.

Durch geeignete Kunststoffolien, die eine spezifische Struktur aufweisen, können vorzugsweise besser unschädliche Luftbestandteile hindurchdiffundieren, während bei anderen Folien praktisch alle Gase ungehindert die Folie passieren.Through suitable plastic films that have a specific Have structure, preferably better harmless Diffuse air components, while practically all gases are unhindered with other foils pass the slide.

Ausgehend von diesen Gedanken, wird deshalb erfindungsgemäß vorgeschlagen, den schadstoffempfindlichen Sensor anzubringen, daß dieser von einem Gasstrom beaufschlagt wird, bei dem durch vorheriges Ausdiffundieren von unschädlichen Gasmolekülen die Konzentration von Schadstoffen im verbleibenden Gasstrom erhöht wird.Based on these thoughts, therefore, is according to the invention suggested the sensitive to pollutants Attach sensor that this from a gas flow is acted upon by the previous Diffusion of harmless gas molecules  Concentration of pollutants in the remaining Gas flow is increased.

Dadurch wird erreicht, daß die verwendeten Halbleitergassensoren in höheren Schadstoffkonzentrationen arbeiten, und die Einflüsse durch Luftfeuchtigkeit, wechselnde Temperaturen, Luftgeschwindigkeiten, vernachlässigbar klein sind.This ensures that the semiconductor gas sensors used in higher pollutant concentrations work, and the influences of humidity, changing temperatures, air speeds, are negligibly small.

In der beiliegenden Abbildung ist die erfindungsgemäße Anordnung dargestellt:
mit (1) der Halbleitergassensor;
mit (2) die vorzugsweise für unschädliche Gase durchlässige Folie;
mit (3) die für alle Gase durchlässige Folie;
mit (4) die Gaspumpe.The arrangement according to the invention is shown in the accompanying figure:
with ( 1 ) the semiconductor gas sensor;
with ( 2 ) the film, which is preferably permeable to harmless gases;
with ( 3 ) the film permeable to all gases;
with ( 4 ) the gas pump.

Selbstverständlich ist die Erfindung nicht auf die vorstehend im einzelnen beschriebenen und dargestellten Ausbildungsformen beschränkt, sondern es sind zahlreiche Abänderungen möglich, ohne jedoch von dem Grundgedanken abzuweichen, Halbleitergassensoren dadurch zu stabilisieren, daß die zu erfassende verunreinigte Luft durch vorgeschaltete gasdurchlässige Folien in ihrer Schadstoffkonzentration erhöht wird, indem die saubere Luft vorher membrantechnisch getrennt wurde.Of course, the invention is not limited to that described and illustrated above in detail Forms of training limited, but there are numerous Changes possible, but without the  The basic idea of deviating from semiconductor gas sensors to stabilize in that the to be recorded polluted air through upstream gas permeable Films in their pollutant concentration is increased by the clean air beforehand was separated by membrane technology.

Claims (3)

Anspruch 1
Verfahren zur stabilisierten Luftmessung über Halbleitergassensoren dadurch gekennzeichnet, daß die zu erfassende Luft in ihrer Zusammensetzung durch membrantechnische Separierung zu höherer Schadstoffkonzentration führt.Claim 1
Method for stabilized air measurement using semiconductor gas sensors, characterized in that the composition of the air to be detected leads to a higher concentration of pollutants due to membrane separation. Anspruch 2
Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 dadurch gekennzeichnet, daß z. B. über die Folie (2) dem Gasstrom unschädliche Bestandteile entzogen werden.Claim 2
Device for performing the method according to claim 1, characterized in that, for. B. can be removed from the gas stream harmless components via the film ( 2 ). Anspruch 3
Vorrichtung zur Durchführung des Verfahrens nach Anspruch 1 und 2 dadurch gekennzeichnet, daß der Meßkammer Luft über die Pumpe (4) zugeführt wird.Claim 3
Device for carrying out the method according to claim 1 and 2, characterized in that air is supplied to the measuring chamber via the pump ( 4 ).
DE19853525774 1985-07-19 1985-07-19 Method for stabilising semiconductor gas sensors by increasing the pollutant concentrations, preferably for motor vehicles Ceased DE3525774A1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
DE19853525774 DE3525774A1 (en) 1985-07-19 1985-07-19 Method for stabilising semiconductor gas sensors by increasing the pollutant concentrations, preferably for motor vehicles
DE8686904172T DE3674373D1 (en) 1985-07-19 1986-07-18 METHOD FOR THE INDICATION OF POLLUTANTS FOR THE CABIN OR THE LIKE serving the STAY OF PEOPLE. DELIVERED AIR.
AT86904172T ATE56824T1 (en) 1985-07-19 1986-07-18 PROCEDURE FOR INDICATION OF POLLUTANTS FOR A CABIN OR THE LIKE USED FOR ACCOMMODATION OF PERSONS. SUPPLIED AIR.
JP50407186A JPS63500541A (en) 1985-07-19 1986-07-18 Hazardous Substance Indication Law for Air Supplied to Rooms Used for Human Residence
EP86904172A EP0231231B1 (en) 1985-07-19 1986-07-18 Process for detecting toxic matter in air which enters a cabin or similar enclosure where persons are present
PCT/EP1986/000423 WO1987000634A1 (en) 1985-07-19 1986-07-18 Process for detecting toxic matter in air which enters a cabin o r similar enclosure where persons are present
BR8606799A BR8606799A (en) 1985-07-19 1986-07-18 PROCESS FOR INDICATING HARMFUL SUBSTANCES IN AIR SUPPLYED TO A CABIN OR SIMILAR UNIT, INTENDED FOR STAYING OF PEOPLE
US07/256,145 US4882287A (en) 1985-07-19 1988-10-05 Process for indicating the presence of toxic substances in air that is supplied to a personnel-occupied space
US07/440,222 US5066466A (en) 1985-07-19 1989-11-21 Apparatus for indicating the presence of toxic substances in air that is supplied to a personnel-occupied space

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19853525774 DE3525774A1 (en) 1985-07-19 1985-07-19 Method for stabilising semiconductor gas sensors by increasing the pollutant concentrations, preferably for motor vehicles

Publications (1)

Publication Number Publication Date
DE3525774A1 true DE3525774A1 (en) 1987-01-29

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ID=6276160

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19853525774 Ceased DE3525774A1 (en) 1985-07-19 1985-07-19 Method for stabilising semiconductor gas sensors by increasing the pollutant concentrations, preferably for motor vehicles

Country Status (2)

Country Link
JP (1) JPS63500541A (en)
DE (1) DE3525774A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19515886A1 (en) * 1995-04-29 1996-10-31 Itvi Inttech Venture Investa Sensor arrangement for controlling indoor ventilation
US5667652A (en) * 1993-11-19 1997-09-16 Gas Research Institute Multi-functional sensor for combustion systems
US6051123A (en) * 1995-06-15 2000-04-18 Gas Research Institute Multi-functional and NOx sensor for combustion systems
DE102006033251A1 (en) * 2006-07-18 2008-02-07 Testo Ag Protective device for a humidity sensor in an aggressive atmosphere

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7070175B2 (en) * 2017-09-26 2022-05-18 Tdk株式会社 Gas sensor
WO2019065127A1 (en) * 2017-09-26 2019-04-04 Tdk株式会社 Gas sensor

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2713623A1 (en) * 1977-03-28 1978-10-05 Preussag Ag Feuerschutz Gas concentration monitor - with side stream pumper in variable volume and circulated through semiconductor measuring module
DE2745957A1 (en) * 1977-10-12 1979-04-19 Du Pont Chemical dosimeter with constant flow air sampling pump - has integrator and amplifier controlling variable drive pump connected to air filter
DE2851299A1 (en) * 1977-11-29 1979-05-31 Z L E H I T Pri Ban ELECTROCHEMICAL PROCESS AND DEVICE FOR DETERMINING THE PARTIAL PRESSURE OF WATER VAPOR IN GASES
DE2911317A1 (en) * 1978-03-22 1979-09-27 Beckman Instruments Inc DEVICE FOR ANALYSIS OF THE EXHAUST GAS OF A MOTOR VEHICLE ENGINE AND THE OPERATING PROCEDURE FOR IT
DE3012380C2 (en) * 1980-03-29 1982-04-15 Drägerwerk AG, 2400 Lübeck Person-worn sampler of organic solvent vapors
DE8128930U1 (en) * 1981-04-03 1982-09-30 E.I. du Pont de Nemours and Co., 19898 Wilmington, Del. Dosimeter for gaseous impurities
DE3309458A1 (en) * 1982-03-16 1983-09-29 Kanegafuchi Kagaku Kogyo K.K., Osaka MEASURING METHOD FOR CONCENTRATING FLAMMABLE INGREDIENTS IN A LIQUID OR A GAS

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2713623A1 (en) * 1977-03-28 1978-10-05 Preussag Ag Feuerschutz Gas concentration monitor - with side stream pumper in variable volume and circulated through semiconductor measuring module
DE2745957A1 (en) * 1977-10-12 1979-04-19 Du Pont Chemical dosimeter with constant flow air sampling pump - has integrator and amplifier controlling variable drive pump connected to air filter
DE2851299A1 (en) * 1977-11-29 1979-05-31 Z L E H I T Pri Ban ELECTROCHEMICAL PROCESS AND DEVICE FOR DETERMINING THE PARTIAL PRESSURE OF WATER VAPOR IN GASES
DE2911317A1 (en) * 1978-03-22 1979-09-27 Beckman Instruments Inc DEVICE FOR ANALYSIS OF THE EXHAUST GAS OF A MOTOR VEHICLE ENGINE AND THE OPERATING PROCEDURE FOR IT
DE3012380C2 (en) * 1980-03-29 1982-04-15 Drägerwerk AG, 2400 Lübeck Person-worn sampler of organic solvent vapors
DE8128930U1 (en) * 1981-04-03 1982-09-30 E.I. du Pont de Nemours and Co., 19898 Wilmington, Del. Dosimeter for gaseous impurities
DE3309458A1 (en) * 1982-03-16 1983-09-29 Kanegafuchi Kagaku Kogyo K.K., Osaka MEASURING METHOD FOR CONCENTRATING FLAMMABLE INGREDIENTS IN A LIQUID OR A GAS

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5667652A (en) * 1993-11-19 1997-09-16 Gas Research Institute Multi-functional sensor for combustion systems
DE19515886A1 (en) * 1995-04-29 1996-10-31 Itvi Inttech Venture Investa Sensor arrangement for controlling indoor ventilation
US6004201A (en) * 1995-04-29 1999-12-21 I.T.V.I. International Techno Venture Invest Aktiengesellschaft Sensor assembly for controlling the ventilation of indoor spaces
DE19515886B4 (en) * 1995-04-29 2004-03-11 Paragon Ag Sensor arrangement for controlling the ventilation of interiors
US6051123A (en) * 1995-06-15 2000-04-18 Gas Research Institute Multi-functional and NOx sensor for combustion systems
DE102006033251A1 (en) * 2006-07-18 2008-02-07 Testo Ag Protective device for a humidity sensor in an aggressive atmosphere

Also Published As

Publication number Publication date
JPS63500541A (en) 1988-02-25

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