Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
GAS MEASURING APPARATUS, GAS ALARM DEVICE AND GAS MEASURING METHOD
Document Type and Number:
Japanese Patent JP2000292401
Kind Code:
A
Abstract:

To provide a gas measuring apparatus and method capable of detecting a very small amt. of the component gas in mixed gas.

Voltage wherein sine wave voltage and random voltage are superposed one upon another by a sine wave voltage generator 16 and a noise generator 18 is applied to a heater 12B and the conductivity of an N-type semiconductor 18 is detected as voltage by a detection resistor RL and the concn. of the component gas in mixed gas is operated by a microcomputer 20. Since weak output voltage exceeding a detection limit temporarily can be detected on the basis of the random change on the surface of an N-type semiconductor 12A, the concn. of a very small amt. of the component gas in the mixed gas can be measured.


Inventors:
KOIZUMI JUNICHI
TANIMOTO HIROSHI
Application Number:
JP9618499A
Publication Date:
October 20, 2000
Filing Date:
April 02, 1999
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
MOTOSAN ENGINEERING CORP
International Classes:
G01N27/12; (IPC1-7): G01N27/12
Attorney, Agent or Firm:
Toshiaki Igarashi



 
Previous Patent: THIN FILM GAS SENSOR

Next Patent: GAS DETECTING METHOD