Title:
INFRARED ABSORPTION TYPE HUMIDITY FLUCTUATION METER
Document Type and Number:
Japanese Patent JP2709209
Kind Code:
B2
Abstract:
PURPOSE: To obtain an infrared absorption type humidity fluctuation meter without a voltage drift in a circuit element and for which the statistical technique is utilizable for the operating process.
CONSTITUTION: An output of a detector which is an output of an amplifier 5 is A/D converted by an A/D converter 9 via a multiplexer 7 and a sample hold circuit 8, and written into a RAM 14 by a CPU 16. A direct current component is obtained from the data written in the RAM 14, and input to a D/A converter 10. At this time, the multiplexer 7 is switched to the side of a differential amplifier 6. Consequently, the fluctuation component of the detector output is outputted from the differential amplifier 6 and then A/D converted by the A/D converter 9 via the multiplexer 7 and the sample hold circuit 8. The output is sampled at many points by the CPU 16. The fluctuation component/detector output is generated from a D/A converter 15.
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Inventors:
Yoshiki Ito
Takaaki Hayashi
Takaaki Hayashi
Application Number:
JP18765191A
Publication Date:
February 04, 1998
Filing Date:
July 26, 1991
Export Citation:
Assignee:
Kaijo Co., Ltd.
International Classes:
G01N21/3554; (IPC1-7): G01N21/35
Domestic Patent References:
| JP534280A | ||||
| JP2253766A | ||||
| JP6029033A |
Attorney, Agent or Firm:
Wakabayashi Tadashi
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