Circuit and method for detecting pressure signal with signal due to pyroelectricity in piezoelectric material being suppressed
A pressure signal and detection circuit technology, applied in the measurement of the force of the piezoelectric device, piezoelectric/electrostrictive/magnetostrictive devices, material selection for piezoelectric devices or electrostrictive devices, etc., It can solve the problems of long conduction speed, etc., and achieve the effect of increased reaction speed, excellent thermal response reduction effect, and high-speed detection
Pending Publication Date: 2020-03-17
DAIKIN IND LTD
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This is because the conduction velocity of the input signal due to temperature is relatively longer (slower) than the conduction velocity of the input signal due to pressure
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[0059] In order to fully understand the present invention, its operational advantages, and objects to be achieved by implementing the present invention, refer to the drawings and the contents described in the drawings illustrating preferred embodiments of the present invention. The features and advantages of the present invention will be further clarified from the following detailed description based on the accompanying drawings. First of all, the terms and words used in this specification and claims should be interpreted as meanings and terms that conform to the technical idea of the present invention based on the principle that the inventor can properly define the concept of the terms in order to explain his invention in the best way. concept. In addition, it should be noted that when it is judged that the specific description of the known functions and structures related to the present invention is unnecessary ambiguous (possibly becoming ambiguous) to the gist of the pre...
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The present invention relates to a circuit and a method for detecting a pressure signal in which a signal due to pyroelectricity from a piezoelectric film is suppressed. In more detail, an input signal from a piezoelectric film is received, the input signal is differentiated in order to analyze a signal component of the input signal, an analysis value of the signal component of the input signal isoutput on the basis of the differentiated value, the analysis value of the signal component is used to eliminate an offset of the input signal, and the input signal is integrated to output a value ofthe input signal due to pressure from which a value of the input signal due to heat has been removed. Therefore, compared to the prior art, the present invention can detect the input signal at a higher speed while significantly reducing the effect caused by a thermal reaction. Furthermore, the present invention can output a signal having an even better thermal reaction damping effect than that obtained by using an additional process for absorbing heat during the manufacture of a piezoelectric film.
Description
technical field [0001] The present invention relates to pressure signal detection, and more specifically, to a detection circuit and method for performing a differential operation on an input signal in order to detect only an input signal caused by pressure from an input signal input to a piezoelectric material, And based on this, after grasping the signal characteristics, only the input signal after removing the input signal caused by heat is distinguished and output. Background technique [0002] Piezoelectric materials (Piezoelectric materials) have a property of responding to a supplied voltage quickly when a relatively large force is generated compared to its own weight, and are used in various fields. Parts using these piezoelectric materials (in other words, forms of piezoelectric materials) are very diverse. Among them, the piezoelectric film (Piezoelectric film) is displaced when a force is applied to both ends of the film, and a voltage is generated in proportion t...
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IPC IPC(8): G01L1/16
CPCG01L1/16G01L9/085G06F3/0418G06F2203/04105H10N15/15H10N30/857G01D1/04G01D1/10H10N30/802H10N30/30H10N30/85H10N30/302
Inventor 金贤植金村崇小谷哲浩韩官荣
Owner DAIKIN IND LTD