Ultrasonic film thickness measuring instrument and measuring method thereof

A measuring instrument, ultrasonic technology, applied in the direction of measuring device, using ultrasonic/sonic wave/infrasonic wave, instrument, etc., can solve the problems of limited thickness range and inaccurate side measurement of oil film thickness, and achieve the effect of simple circuit design

Inactive Publication Date: 2013-09-18
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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AI Technical Summary

Problems solved by technology

The measurable thickness range of this theoretical method is limited, and the maximum accuracy can reach 1μm. It is impossible to accurately measure the thickness of the oil film less than 1μm.

Method used

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  • Ultrasonic film thickness measuring instrument and measuring method thereof
  • Ultrasonic film thickness measuring instrument and measuring method thereof
  • Ultrasonic film thickness measuring instrument and measuring method thereof

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Embodiment Construction

[0039] Below in conjunction with accompanying drawing, the technical scheme of invention is further described:

[0040] The thickness of the oil film in different mechanical equipment is different. In order to distinguish, the concepts of thin oil film and thick oil film are defined in the present invention. Generally, when the thickness of the oil film is much smaller than the wavelength of the incident wave, it is called a thin oil film, otherwise it is called a thick oil film. Two calculation models are established for different oil film thicknesses, the resonance model is used for thick oil film, and the spring model is used otherwise. This is the theoretical model to finally calculate the oil film thickness.

[0041] Such as figure 1 As shown, the oil film to be tested (that is, medium II) is located between mediums I and III, and the figure shows the propagation of ultrasonic waves in the three-layer medium.

[0042] When the oil film is thick, a resonance model is est...

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Abstract

The invention provides an ultrasonic measuring instrument and a measuring method for monitoring the thickness of an oil film between two contacted surfaces. The ultrasonic measuring instrument comprises a pulse transmission circuit, an ultrasonic excitation circuit, an ultrasonic receiving circuit, a data acquisition communication circuit and a personal computer (PC) which are sequentially connected, wherein the ultrasonic excitation circuit is further connected with an ultrasonic transducer; and the pulse transmission circuit and the data acquisition communication circuit share the same single-chip microcomputer. Compared with a traditional ultrasonic thickness measuring instrument, the size of the ultrasonic thickness measuring instrument is smaller due to a digital integrated circuit, the analog-to-digital (A / D) sampling rate is very high, radio frequency sampling is directly carried out to an ultrasonic signal, and the information is not lost. A circuit design is simpler, and corresponding data can be processed. The designed instrument adopts a new oil film thickness calculation method, can measure oil film thicknesses of nano level, and is more applicable to measuring the thicknesses of lubricating oil films.

Description

technical field [0001] The invention relates to the field of ultrasonic measurement of oil film thickness, in particular to an instrument for measuring the thickness of lubricating oil film by ultrasonic waves. Background technique [0002] In industrial production, in order to reduce the friction and wear that occur when the surfaces of workpieces in contact with each other are in relative motion, lubricants are often added between the surfaces. Among them, liquid lubrication is a common lubrication method in industry. Considering the nature and cost of lubricants and other factors, most mechanical equipment such as bearings, gears, pistons and other sealing devices choose mineral oil as lubricants. When studying liquid lubrication, it is mainly to analyze the thickness of the oil film between friction pairs, the shape of the oil film, and the pressure distribution in the oil film. The main basis for judging the lubrication state of mechanical equipment is the film thickne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B17/02
Inventor 马希直杨晓
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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