Title:
感知装置
Document Type and Number:
Japanese Patent JP4611954
Kind Code:
B2
Abstract:
In a sensing instrument using a quartz sensor on whose front surface an adsorption layer for adsorbing a substance to be sensed is formed and which changes in natural frequency by the adsorption of the substance to be sensed, the present invention has an object to quickly detect a trouble of the quartz sensor to prevent an operator from recognizing an incorrect measurement result. In the present invention, a level detecting circuit detecting a signal level of an oscillation output of an oscillator circuit is provided, and after the time for stabilization passes after the power-on time, a computer takes a level detection value therein to compare the signal level and a threshold value. Then, when the signal level is lower than the threshold value, the signal level is determined as abnormal and, for example, the abnormality notification is displayed on a display unit, whereby an operator is notified of the occurrence of the abnormality.
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Inventors:
Naoki Onishi
Hiroyuki Kusada
Shunichi Wakamatsu
Hiroyuki Kusada
Shunichi Wakamatsu
Application Number:
JP2006269270A
Publication Date:
January 12, 2011
Filing Date:
September 29, 2006
Export Citation:
Assignee:
Nippon Denpa Industry Co., Ltd.
International Classes:
G01N5/02; G01G3/16
Domestic Patent References:
| JP7103873A | ||||
| JP2005009862A | ||||
| JP2001083154A |
Attorney, Agent or Firm:
Toshio Inoue