Non-contact type solid material longitudinal wave sound velocity measurement device and sound velocity measurement method

Abstract

The invention discloses a non-contact type solid material longitudinal wave sound velocity measurement device. The device comprises a liquid tank, a transmitting transducer, a receiving transducer anda signal acquisition processor, wherein the liquid tank contains a to-be-measured material and is filled with a liquid which does not damage the characteristics of the to-be-measured material; the transmitting transducer is configured on one side of the liquid tank and emits a series of sound waves at different frequencies; the receiving transducer is configured on the side, opposite to the sidewhere the transmitting transducer is configured, of the liquid tank and receives sound waves penetrating through the to-be-measured material; the signal acquisition processor processes waveform of thesound waves received by the receiving transducer to obtain transmission energy of a series of transmitting sound waves at different frequencies, and the longitudinal wave sound velocity of the to-be-measured material is obtained according to the corresponding sound wave frequency when the transmission energy is the highest. By means of the device, the defect that contact type sound velocity measurement devices in the prior art cannot measure longitudinal wave sound velocities of materials not suitable for contact, loose and soft materials, thinner materials and the like is overcome, and the longitudinal wave sound velocity of the to-be-measured material can be obtained accurately without contact of a probe with the to-be-measured material.

Description

technical field [0001] The invention relates to a non-contact solid material longitudinal wave sound velocity measurement device and a sound velocity measurement method capable of accurately measuring the longitudinal wave sound velocity without contacting the solid material. Background technique [0002] At present, the well-known longitudinal wave sound velocity measurement of solid materials is that the longitudinal wave probe is directly in close contact with the measured object, and the length or thickness of the measured object is divided by the time required for the longitudinal wave to pass through this length or thickness (hereinafter referred to as the time difference). The longitudinal wave sound speed of the object. However, some characteristics of many solid materials make it not suitable for direct contact with the probe: for example, some highly corrosive materials will cause irreversible damage to the probe; the measured object and the probe need to be in clo...

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Problems solved by technology

[0003] In order to overcome the deficiency that the existing contact-type sound velocity measuring device cannot measure the longitudinal wave sound velocity of materials such as unsuitable contact materials, soft materials, thin materials, etc., the present invention provides a longitudinal wave sound velocity measuring device and a sound velocity measuring method. The measuring device does not need a probe and When the measured object is in contact, the accurate longitudinal wave sound velocity of the measured object can be obtained

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