Ultrasonic sensing device with function of adjusting signal attenuation time and application method

Abstract

The invention relates to an ultrasonic sensing device with the function of adjusting signal attenuation time and an application method, the device comprises a pre-processing module and an ultrasonic transceiving module, and the method comprises the following steps: leading the pre-processing module to produce a first driving signal so as to lead the ultrasonic transceiving module to receive the first driving signal, provide vibration according to the first driving signal and transmit a sensing wave; leading the pre-processing module to stop the first driving signal so as to lead the vibration in the ultrasonic transceiving module to enter into the attenuation state and further form an attenuation signal; leading the pre-processing module to produce a second driving signal according to the first driving signal and transmit the second driving signal onto the ultrasonic transceiving module; and leading the ultrasonic transceiving module to receive the second driving signal and offset the attenuation signal trough the second driving signal so as to shorten the attenuation time of the attenuation signal and further receive a reflected wave after reflecting the sensing wave.

Description

technical field [0001] The invention is an ultrasonic sensing device with signal decay time adjustment function and a method applied thereon. In particular, it refers to a device and method for rapidly reducing vibration by inputting a drive signal with a specified phase, amplitude, pulse number and frequency to the component that generates ultrasonic waves to reduce the decay time of the internal decay signal. Background technique [0002] Ultrasonic Transducer is a widely used device utilizing ultrasonic transmission technology. In the current application, the ultrasonic sensing device can be a single emission type, that is, to generate the desired vibration effect by emitting sound waves of a specific frequency; or it can also be a design that includes both ultrasonic emission and reception of its reflection, That is to say, both the transmitter and the receiver are arranged in the ultrasonic sensing device, and both of them face the same direction to transmit the ultras...

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Problems solved by technology

Although the attenuation signal RS reaches a state smaller than the trigger boundary L at time t1, the required attenuation time is too long, which means that the dead zone Z d The range of the reflection signal ES is too large, but it fails to reach the state smaller than the trigger boundary L before the time t2 when the reflection signal ES is received, which in turn affects the reception of the subsequent reflection signal ES and results in the mixing of the two signals, making the processing impossible. Clearly distinguish the time of receiving the reflected wave and its corresponding waveform

Therefore, the dead zone Z d The existence of the ultrasonic sensor will cause the ultrasonic sensing device to be unable to perform short-distance detection

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