Novel frequency measurement method based on surface acoustic wave sensor

A surface acoustic wave and frequency measurement technology, which is applied in the direction of frequency measurement devices, can solve the problems of high signal measurement value and low signal measurement accuracy, and achieve the effect of improving measurement accuracy

Inactive Publication Date: 2015-06-10
延安大学西安创新学院
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Problems solved by technology

During the detection process, the measurement accuracy of the signal with a lower frequency value is lower, and the measurement value of the signal with a higher frequency value is higher.

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  • Novel frequency measurement method based on surface acoustic wave sensor
  • Novel frequency measurement method based on surface acoustic wave sensor
  • Novel frequency measurement method based on surface acoustic wave sensor

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with specific embodiments. The exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not as a limitation to the present invention.

[0024] A novel frequency measurement method based on a surface acoustic wave sensor is used to measure the frequency f to be measured after the frequency difference between two surface acoustic wave sensors SAWR1 and SAWR2 with similar frequencies, including the following steps, such as figure 1 Shown:

[0025] 1) Measure the median frequency f of the surface acoustic wave sensor SAWR1 or SAWR2 0 , the median frequency Among them, f c is the frequency of counting pulses when measuring the period, and T is the gate time selected for direct frequency measurement;

[0026] 2) Record the output signal of the surface acoustic wave sensor SAWR1 as the output frequency f 1 ;

[0027] 3) The output frequency f 1 resp...

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Abstract

The invention discloses a novel frequency measurement method based on a surface acoustic wave sensor. The method is that a surface acoustic wave band-pass filter is used for pre-selecting measured frequency; the frequency measuring method is carried out for a signal exceeding medium frequency, and the cycle measuring method is carried out for the signal below the medium interface; a D triggering device is used for reducing the frequency to obtain the signal with relatively low frequency; then a nixie tube is used for displaying the measurement result. Compared with the prior art, the method has the advantages that the problem of large error occurring during measuring the upper limit and lower limit of the frequency in the traditional frequency measuring method can be solved; the measuring precision is relatively increased by being compared with the traditional frequency measuring method; the method is worthy of popularization and application in each industry.

Description

technical field [0001] The invention relates to the technical field of frequency measurement, in particular to a novel frequency measurement method based on a surface acoustic wave sensor. Background technique [0002] The traditional frequency measurement is to use the frequency counting circuit to count the frequency signal within a specified time. This specified time is the gate time, and the gate time is provided by the bistable circuit. The measured frequency value f x , is at gate time T g The count value of internal pulses N x with gate time T g The ratio of f x N x / T g . [0003] When the frequency counter is running normally, the counted signal pulse first passes through the gate and then enters the counter. Generally, the opening and closing of the gate and the time of counting pulse input at the port are different. Therefore, in the same gate time, when the frequency counter counts the same pulse signal, the final display value is different, that is, a p...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02
Inventor 马惠铖白海涛柴荣军
Owner 延安大学西安创新学院
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