A surface acoustic wave sensor excitation and query device and its frequency offset acquisition method
A surface acoustic wave, query device technology, applied in the field of sensors, to ensure integrity and eliminate overshoot effects
Active Publication Date: 2019-04-12
BEIJING INST OF TECH ZHUHAI CAMPUS
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It can be seen from the formula that blindly increasing the sampling rate of the echo signal is useless for frequency resolution
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Embodiment 1
[0050] Such as Figure 7 , the SAW sensor excitation and query device in this embodiment includes a transmitting link, a receiving link, an echo signal processing module, an overshoot shaping module, a selection switch and a control module.
[0051] The transmitting link is used to transmit the excitation signal under the control of the overshoot shaping module, its input end is connected to the control module, and its output end is connected to the selection switch.
[0052] The receiving link is used to receive the echo signal under the control of the overshoot shaping module, its input end is connected to a selection switch, and its output end is connected to an external device.
[0053] The echo signal processing module is used to perform FFT processing on the echo signal output by the surface acoustic wave sensor to output frequency deviation, and its input terminal is connected to the receiving link and the control module.
[0054] The overshoot shaping module is used t...
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The surface acoustic wave sensor excitation and query device of the present invention comprises a transmitting link, a receiving link, an overshoot shaping module, a selection switch and a control module; the transmitting link is used to transmit an excitation signal under the control of the overshoot shaping module , its input end is connected to the control module, its output end is connected to the selection switch; the receiving link is used to receive the echo signal under the control of the overshoot shaping module, and its input end is connected to the selection switch; the overshoot shaping module is used to control the The overshoot of the switch control signal generated by the module is eliminated, its input terminal is connected to the control module, and its output terminal is respectively connected to the control terminal of the transmitting link, the receiving link and the selection switch; the selection switch, according to the received signal from the overshoot shaping module The switch control signal of the transmission link or the reception link is selected, and one end is connected to the antenna; the control module is used to configure the output frequency of the signal source in the transmission link and the reception link, and simultaneously generate the switch control signal.
Description
【Technical field】 [0001] The invention relates to the technical field of sensors, in particular to a device for exciting and inquiring by using an acoustic surface sensor. 【Background technique】 [0002] Surface acoustic wave (SAW) sensors are sensitive to many physics, chemistry or biomass, and have been deeply researched in temperature monitoring, torque measurement, air pressure monitoring and biochemical detection. [0003] But in general, the SAW sensor is a passive system, that is to say, an external excitation signal is needed to excite the SAW sensor, and then the SAW sensor sends out an echo. Usually, the frequency deviation of the echo relative to the excitation signal carries these physical, chemical or biomass information. Information such as temperature, torque, air pressure, etc. The device that excites the SAW sensor and receives the echo of the sensor to measure the frequency offset is the surface acoustic wave (SAW) sensor excitation and query device, also ...
Claims
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IPC IPC(8): H03L7/085H03H9/145G01K11/26G06K9/00
CPCH03H9/145H03L7/085G01K11/265G06F2218/08
Inventor 张连波苏秉华陈景国程加斌王云平姚叔敏曾雪亮
Owner BEIJING INST OF TECH ZHUHAI CAMPUS