Intrinsic frequency measuring method for long and thin object
A technology for natural frequency and slender objects, applied to measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of inapplicability and difficulty in distinguishing the natural frequencies of longitudinal waves or transverse waves, etc., and achieve accurate measurement results
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[0032] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0033] as attached figure 1 Shown is a measured pipeline longitudinal vibration natural frequency measuring device adopted by the present invention, wherein N and S respectively represent the two poles of the bias magnetic field, N is an N pole, and S is an S pole; the device includes the following modules:
[0034] Signal generation module: use a combination of a microcontroller and a signal generation circuit to generate a pulse signal that triggers the signal acquisition module and a wide-spectrum pulse excitation signal that is output to the power amplifier;
[0035] Power amplifier: composed of operational amplifiers and power devices to generate the excitation current i(t);
[0036] Sensors: including excitation sensors and detection sensors, which are composed of a bias magnetic field and a coil respectively. The bias magnetic field is ...
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