Title:
SEISMIC DETECTOR
Document Type and Number:
Japanese Patent JP3440075
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To solve the problems that conventionally seismic detectors accuracy enhancement is difficult due to wide variations in capacitance type sensors, and due to changes in the airtightness of a capacitance type sensor, its output characteristics vary to disable conducting of accurate measurements and such a defect being hard to find.
SOLUTION: This seismic detector is equipped with a capacitance type sensor and a storage means. The sensor is hermetically stored in a gas atmosphere and has a fixed electrode and a movable electrode displaced, according to the quantity of input. The storage means stores a relation between the quantity of input and an output result obtained from the sensor in response the quantity of input. Defect in airtightness is detected by applying an a-c voltage to an electrode for self-diagnosis.
Inventors:
Takashi Yanada
Hiroyuki Furukawa
Hikaru Takubo
Yoshihisa Shimizu
Kenichi Koganemaru
Hiroyuki Furukawa
Hikaru Takubo
Yoshihisa Shimizu
Kenichi Koganemaru
Application Number:
JP2000356501A
Publication Date:
August 25, 2003
Filing Date:
November 22, 2000
Export Citation:
Assignee:
YAMATAKE CORPORATION
Tokyo Gas Co., Ltd.
Tokyo Gas Co., Ltd.
International Classes:
G01H1/00; G01P15/125; G01V1/00; G01V1/18; G01P21/00; (IPC1-7): G01P15/125; G01H1/00; G01P21/00; G01V1/00; G01V1/18
Domestic Patent References:
| JP7120499A | ||||
| JP5164779A | ||||
| JP9222484A | ||||
| JP6331647A | ||||
| JP8178957A | ||||
| JP5223844A | ||||
| JP7167891A | ||||
| JP832090A | ||||
| JP6148234A | ||||
| JP2001221810A | ||||
| JP2001264355A | ||||
| JP2001330621A |
Attorney, Agent or Firm:
Hiroaki Tazawa (1 person outside)