An ultrasonic film thickness measuring instrument and its measuring method

A measuring instrument and ultrasonic technology, applied in measuring devices, using ultrasonic/sonic/infrasonic waves, instruments, 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: 2016-08-10
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Claims
  • Application Information

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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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  • An ultrasonic film thickness measuring instrument and its measuring method
  • An ultrasonic film thickness measuring instrument and its measuring method
  • An ultrasonic film thickness measuring instrument and its measuring method

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Embodiment Construction

[0039] The technical scheme of the invention is further described below in conjunction with the accompanying drawings:

[0040] The thickness of the oil film in different mechanical equipment is different. In order to distinguish, the concept of thin oil film and thick oil film is 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 thickness, the resonance model is used for thick oil film, and the spring model is used otherwise. This is the theoretical model for the final calculation of the oil film thickness.

[0041] like figure 1 As shown, the oil film to be tested (ie, 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 i...

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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 lubricating oil film thickness by using ultrasonic waves. Background technique [0002] In industrial production, in order to reduce the friction and wear when the surfaces of the workpieces in contact with each other move relative to each other, lubricants are often added between the surfaces. Among them, liquid lubrication is a commonly used lubrication method in the industry. Considering factors such as the nature and cost of the lubricant, most of the mechanical equipment such as bearings, gears, pistons and other sealing devices choose mineral oil as the lubricant. When studying liquid lubrication, it is mainly to analyze the thickness of the oil film between the 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 equipme...

Claims

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Application Information

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