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Surface acoustic wave sensor excitation and inquiry device and frequency offset obtaining method thereof

A surface acoustic wave, query device technology, applied in the field of sensors

Active Publication Date: 2016-08-17
BEIJING INST OF TECH ZHUHAI CAMPUS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen from the formula that blindly increasing the sampling rate of the echo signal is useless for frequency resolution

Method used

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  • Surface acoustic wave sensor excitation and inquiry device and frequency offset obtaining method thereof
  • Surface acoustic wave sensor excitation and inquiry device and frequency offset obtaining method thereof
  • Surface acoustic wave sensor excitation and inquiry device and frequency offset obtaining method thereof

Examples

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Embodiment 1

[0050] like 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 to e...

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Abstract

The invention discloses a surface acoustic wave sensor excitation and inquiry device which comprises a transmitting link, a receiving link, an overshoot shaping module, a selective switch and a control module. The transmitting link is used for transmitting excitation signals under control of the overshoot shaping module, the input end of the transmitting link is connected with the control module, and the output end of the transmitting link is connected with the selective switch; the receiving link is used for receiving echo signals under control of the overshoot shaping module, and the input end of the receiving link is connected with the selective switch; the overshoot shaping module is used for eliminating overshoot of switch control signals generated by the control module, the input end of the overshoot shaping module is connected with the control module, and the output end of the overshoot shaping module is connected with the transmitting link, the receiving link and the control end of the selective switch; the selective switch is used for enabling the transmitting link or the receiving link to be connected according to the received switch control signals from the overshoot shaping module, and one end of the selective switch is connected with an antenna; the control module is used for configuring output frequency of signal sources in the transmitting link and the receiving link and meanwhile generating the switch control signals.

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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Application Information

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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
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