Measuring circuit, measuring equipment and measuring method of vibration type viscoelastic force sensor

Abstract

The invention provides a measuring circuit of a vibration type viscoelastic force sensor, which comprises an adjusting circuit, a controller, a voltage control current source, an analog switch, a viscoelastic force sensor, a signal acquisition circuit, an analog-to-digital converter and a reference resistor, and enables a measuring result to be insensitive to drift of most circuit parameters; thesignal measured by the circuit is in direct proportion to the impedance of the sensor, complex transformation is not needed, the calculation complexity is reduced, the precision is improved, the circuit structure is simple, the working point of the sensor is convenient to set, and the circuit is suitable for various to-be-measured samples and does not stop oscillation easily. The invention furtherrelates to a measuring method of the vibration type viscoelastic force sensor. According to the method, the contradiction between the frequency resolution and the time sampling rate during scanning is balanced, and the effects of better frequency resolution and higher time sampling rate can be obtained. The invention further relates to measuring equipment of the vibrating type viscoelastic forcesensor.

Description

Technical field [0001] The invention relates to the technical field of viscoelastic force measuring instruments, in particular to a measuring circuit, measuring equipment and measuring method of a vibrating viscoelastic force sensor. Background technique [0002] Vibration-type viscoelastic force measuring devices usually use a mechanical probe that is driven to periodically oscillate. The mechanical probe is in contact with the sample to be tested, and the viscoelasticity of the sample will affect the motion state of the probe. The viscoelasticity of the sample to be tested can be analyzed by monitoring the motion state of the probe. An existing vibrating viscoelastic force sensor whose structure is similar to an electrodynamic speaker. [0003] The structure diagram of the viscoelastic sensor and the split diagram are as follows: figure 1 , figure 2 Shown. The permanent magnet generates a uniform magnetic field in the air gap between it and the magnetic pole; the probe adapte...

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Problems solved by technology

[0015] It can be seen that there is a contradiction between the requirements of frequency resolution and time sampling rate: to improve the frequency resolution, a smaller frequency adjustment step is required. In the case of the same scanning interval, more scanning frequency points are inevitably required, thus leading to a reduction in the temporal sampling rate

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