Non-fuzziness measuring method on ultrasonic transmission time
A technology of transmission time and measurement method, which is used in the measurement of ultrasonic/sonic/infrasonic waves, measurement devices, instruments, etc., to achieve the effect of high precision and good measurement stability
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[0028] ④ Specific instance parameters:
[0029] The frequency of the signal sent for the first time is 40khz, the frequency of the signal sent for the second time is 41khz, the delay is 5us, and the test result is 5.014us. At this time, f 0 Δtmax =40.
[0030] The frequency of the signal sent for the first time is 400khz, the frequency of the signal sent for the second time is 320khz, the delay is 5.55us, the test result is 5.54us, f 0 Δt>1, and [f 0 Δt]=2,N max =-5.
[0031] Since the digitally controlled oscillators 12 and 15 are well-known technologies in the industry, only figure 2Make a brief description. The input of the frequency control word input port 19 and the data input by the numerically controlled oscillator frequency offset control word input port 20 are input in the digital adder 21 simultaneously, after adding in the digital adder 21, the output of the digital adder 21 is sent into The phase accumulator 22 continuously accumulates the input, and the out...
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