Piezoelectric acceleration sensor

Abstract

Abstract PURPOSE:To prevent noise from occurring due to a pyroelectric effect, etc. by providing a compensating piezoelectric body made of the same material and having the same electrode area as a film piezoelectric body for detecting acceleration in the vicinity of a detector. CONSTITUTION:A film piezoelectric body 13 and a load 14 are laminated on a seat 11 to constitute a sensor A. The load 14 functions as an interial mass part and, with acceleration applied, generates strain on the film piezoelectric body 13. A compensating piezoelectric body 15 made of a film piezoelectric body having approximately the same electrode area as the film piezoelectric body 13 is adhered to a side of the film piezoelectric body 13 of the sensor A on the upper face of the seat 11, while electrodes of both piezoelectric bodies 13, 15 are wired to eliminate electric charge generated by a pyroelectric effect caused when a temperature has rapidly changed. Thus no noise is generated even if the temperature has rapidly changed. In addition common mode noise can be reduced.

Inventors

• 👤 Takayuki Imai
• 👤 隆之 今井
• 👤 Shiro Nakayama
• 👤 中山　四郎
• 👤 Satoshi Kunimura
• 👤 國村　智
• 👤 Katsuhiko Takahashi
• 👤 克彦 高橋

Bibliographic Details