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Differential piezoelectric acceleration sensor

A piezoelectric acceleration and sensor technology, applied in the direction of acceleration measurement using inertial force, can solve the problems of the sensor itself, such as heavy weight, poor temperature transient characteristics, poor strain resistance, etc., to achieve high sensitivity, easy to process and manufacture, improve The effect of the ability to resist strain

Inactive Publication Date: 2006-11-15
CHONGQING UNIV
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Problems solved by technology

However, the housing of this piezoelectric acceleration sensor is difficult to process, has poor temperature transient characteristics and poor strain resistance, and the sensor itself has a large weight due to the use of two inertial masses; It is applied through the shell. When the external conditions (such as temperature, sound) change, the pretightening force of the piezoelectric element will be affected, and the interference signal will be added to the piezoelectric element, resulting in an undesired non-vibration signal output, increasing the test error

Method used

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Embodiment Construction

[0012] A differential piezoelectric acceleration sensor (reference figure 2 ). The sensor includes a base, a housing with a socket that is mounted on the base 011, a piezoelectric element fixedly installed in the housing through a pre-tightening bolt, a gasket and an inertial mass, and a piezoelectric element connected to the The signal lead of the socket. The feature of the present invention is that the piezoelectric element, gasket and inertial mass 09 in the housing 02 are installed on the base 013 . The base 013 is an isolation base, which is a rotating body formed by rotating 180° with the vertical center line of the I-shaped section as the axis. On the upper disk surface of the base 013, through the pre-tightening bolts screwed on the axis, from bottom to top, there are circular rings with the same outer diameter as the upper disk of the base 013. Equal PTFE gasket 014, electrode 015, lower piezoelectric element 016, electrode 017, PTFE gasket 018, an inertial mass 0...

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Abstract

The present invention relates to a differential piezoelectric acceleration transducer. It includes an isolated base seat which uses vertically-drawn central line of H-type section as axis and can be rotated at 180 deg. to form rotator and a shell body which is cover-mounted on said base seat and is equipped with a plug socket. On the upper disk surface of said base seat from bottom to top are successively fixed Teflon washer, electrode, lower piezoelectric element, electrode, Teflon washer, inertial mass block, Teflon washer, electrode, upper piezoelectric element, electrode and Teflon washer. The signal lead wires connected with piezoelectric elements are directly connected on the all electrodes respectively, and said shell body is fixedly coupled with lower disk of said isolated base seat.

Description

technical field [0001] The invention relates to an acceleration sensor, in particular to a differential piezoelectric acceleration sensor. Background technique [0002] Acceleration sensor is a kind of sensor family, the patent number is 01218061.0, and the name is "differential piezoelectric acceleration sensor" is one of them. The accelerometer (see figure 1 ) consists of an upper inertial mass 1, an upper piezoelectric ceramic 2, a housing 3, a lower piezoelectric ceramic 4, a ground lead 5, an upper cover 6, fastening bolts 7, a signal output line 8, and a lower inertial mass Block 9 and base 10 constitute. When the sensor is moved by force, the inertial action of the two inertial mass blocks will cause the surface of the piezoelectric element to generate a charge corresponding to the measured acceleration, and the measured acceleration will be reflected by detecting the charge output. However, the housing of this piezoelectric acceleration sensor is difficult to proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01P15/09
Inventor 刘俊秦岚刘京诚李敏
Owner CHONGQING UNIV
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