Non-contact collecting probe

Abstract

The invention provides a non-contact collecting probe and belongs to the field of ultrasonic vibration detection. The non-contact collecting probe comprises a base and piezoelectric ceramic. The base is in an elastic arc structure with concave front and convex back. The piezoelectric ceramic is adhered to the back of the arc base, and a polarization direction of the piezoelectric ceramic is along through-thickness direction of the base, namely normal direction of the base. By the aid of the non-contact collecting probe, an emitting point medium is never damaged, and nondestructive testing is achieved. The non-contact collecting probe is a non-contact emission source, an emitter is not lifted or lowered at the moving position, and accordingly production efficiency of the non-contact collecting probe is high. A focus of the non-contact collecting probe on a model can be diminished to 0.2mm by focusing, the requirement for scaling down of a field focus is met, and simulation is more vivid.

Description

technical field [0001] The invention belongs to the field of ultrasonic vibration detection, in particular to a non-contact aggregation probe. Background technique [0002] Earthquake physical simulation research refers to the use of physical models to study earthquakes and related phenomena (especially fluctuation phenomena). It is an important part of experimental geology, also known as model geology. The most commonly used method in model geology studies is the ultrasonic method, and is therefore often referred to as ultrasonic seismic modeling. Ultrasonic seismic physical model experiments conduct indoor simulation observations of the propagation of seismic waves in various complex geological bodies through the observation of ultrasonic propagation in geological models, and conduct seismological research based on the observation results. It explains and solves many practical problems in geophysical exploration, thus greatly promoting the development of seismological the...

AI Technical Summary

Problems solved by technology

[0011] Existing ultrasonic detection methods have certain shortcomings and limitations when used for geological model detection

[0012] ① Piezoelectric ultrasonic probes are relatively simple and low in price, but when performing geological model testing, there will be some problems when using piezoelectric probes for transmission and reception

The damage of this point will affect the next excitation effect at this point

When performing physical model detection, it is required to emit ultrasonic signals multiple times at the same emission point (we call it the shot point), which means that the point is irradiated by the intense pulsed laser source multiple times, and each irradiation is required The state of the previous point will not change, that is, the repeatability is good, but it is difficult to achieve this with an intense pulsed laser source

If the emission energy is reduced, the generated ultrasonic emission energy is not enough, and the signal cannot reach the deep layer of the model

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