Ultrasonic measuring device for oil film thickness

A technology of ultrasonic measurement and oil film thickness, which is applied in the direction of measuring devices, using ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problem of signal resolution reduction and achieve the effect of reducing manufacturing costs

Inactive Publication Date: 2013-08-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0009] At present, commonly used signal generators are designed using VHDL language and the principle of direct digital synthesizer (DDS). DDS is a new type of frequency synthesizer with high frequency resolution and can quickly perform frequency It is easy to realize frequency, phase and amplitude modulation, but there are also some problems. Its frequency cannot be changed in small steps, and the generated signal is very high in frequency. resolution will be reduced

Method used

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  • Ultrasonic measuring device for oil film thickness
  • Ultrasonic measuring device for oil film thickness

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Embodiment Construction

[0023] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0024] Such as figure 1 As shown, the ultrasonic measurement device for oil film thickness includes: a pulse train signal generator, an ultrasonic excitation circuit, an ultrasonic transducer, and a data collector. The pulse train signal generator transmits the high frequency pulse train signal to the ultrasonic excitation circuit. The ultrasonic excitation circuit outputs high-voltage pulses under the excitation of high-frequency pulse train signals. The ultrasonic transducer converts the high-voltage pulse into the test ultrasonic wave, which is output to the oil film. The data collector collects the reflected ultrasonic waves of the oil film.

[0025] The pulse train signal generating circuit such as figure 2 As shown, it includes single-chip microcomputer, pulse generation chip MAX038, frequency control circuit, pulse train transmitting circuit, and ampli...

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Abstract

The invention discloses an ultrasonic measuring device for oil film thickness and belongs to the technical field of ultrasonic detection. The ultrasonic measuring device comprises a pulse train signal generator, an ultrasonic excitation circuit, an ultrasonic transducer and a data collector, the pulse train signal generator comprises a single chip microcomputer, a pulse generating chip, a frequency control circuit, a pulse train emitting circuit and an amplifier, and the frequency control circuit comprises an input capacitance branch composed of a plurality of switch tubes and a capacitor. The ultrasonic measuring device for oil film thickness emits high-frequency and high-voltage pulse signals, manufacturing cost is lowered, and the ultrasonic measuring device is suitable for exciting high-frequency ultrasonic transducers to emit ultrasonic waves in nondestructive detection.

Description

technical field [0001] The invention discloses an ultrasonic measuring device for oil film thickness, which belongs to the technical field of ultrasonic detection. Background technique [0002] In modern industrial production, friction will occur when any two surfaces in contact with each other move relative to each other. In order to reduce the friction loss between the contact surfaces, a lubricant is usually added between the two contact surfaces. Lubricants can be liquids, gases, or solids. Good mechanical lubrication can not only improve the mechanical efficiency, ensure the normal operation of the machine, but also reduce energy waste. [0003] According to the working conditions of relative moving parts and the role of lubricating oil between friction surfaces, mechanical lubrication is usually divided into fluid lubrication and boundary lubrication, among which fluid lubrication is a common lubrication method in mechanical lubrication. Fluid lubrication usually ad...

Claims

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Application Information

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