Title:
METHOD FOR CONFIRMING OPERATION OF EARTHQUAKE SENSOR
Document Type and Number:
Japanese Patent JPS63222227
Kind Code:
A
Abstract:
PURPOSE:To simply confirm operation even on the spot, by preliminarily investigating the relation between the angle of inclination of a sensor and DC component output and investigating whether the angle of inclination and DC component output of the sensor satisfy the aforementioned relation. CONSTITUTION:The output signal of a detection part 1, constituted so that the liquid in a container is irradiated with light and the output of a photoelectric converter element receiving the reflected light from said liquid is amplified only in its AC component by a preamplifier 21, to obtain the voltage corresponding to vibration acceleration. Herein, the detection part 1 is accelerated in a factory at operation acceleration and, after the set voltages of comparators 22, 23 are set to V1, V2 so as to make it possible to detect said acceleration, the detection part 1 is inclined to preliminarily read angle (theta1), (theta2) of inclination when the output 24a of a preamplifier 24 containing a low band-pass filter becomes V1, V2. The detection part 1 is inclined by angles theta1, theta2 of inclination on the spot and the output voltage of the preamplifier 24 is compared with voltages V1, V2 to confirm the operation.
Inventors:
KO HIROSHI
TOKUYAMA TAKASHI
TOKUYAMA TAKASHI
Application Number:
JP5761187A
Publication Date:
September 16, 1988
Filing Date:
March 12, 1987
Export Citation:
Assignee:
FUJITEC KK
International Classes:
G01P15/02; G01H1/00; G01P15/08; G01P15/093; (IPC1-7): G01H1/00; G01P15/02; G01P15/08
Domestic Patent References:
| JPS61164125A | 1986-07-24 | |||
| JPS53138382A | 1978-12-02 |