A device and method for detecting the inner wall of an engine cylinder based on digital holographic interference

An engine cylinder, digital holography technology, applied in measurement devices, optical devices, instruments, etc., can solve problems such as inapplicability to three-dimensional surface detection, narrow space, and inability to put laser interference systems in it, achieving good real-time performance and universality The effect of good performance and large measuring range

Active Publication Date: 2019-10-25
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

However, the inner surface of the cylinder has the characteristics of closed and narrow space (diameter less than 120mm), and it is impossible to put a laser interference system with a complex structure in it.
The detection beam generated by the tradition

Method used

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  • A device and method for detecting the inner wall of an engine cylinder based on digital holographic interference
  • A device and method for detecting the inner wall of an engine cylinder based on digital holographic interference
  • A device and method for detecting the inner wall of an engine cylinder based on digital holographic interference

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Embodiment

[0052] The present invention proposes and designs a method and device for detecting the inner wall of an engine cylinder based on digital holographic interference. Generally, the device is also suitable for detecting the inner wall of any other deep holes such as gun barrels and other military products that require high-precision three-dimensional inner wall detection. The application embodiment of the present invention in the technology of spraying the inner wall of cylinder processing will be described in detail below in conjunction with the accompanying drawings.

[0053] Install the laser 1 in a constant temperature and humidity vibration isolation box, so that the frequency stability is better than 10 -7 , if the experiment shows that passive frequency stabilization measures cannot make the laser reach 10 in the environment of the measurement site -7 If the frequency stability is low, use a laser integrated with active frequency stabilization technology; the laser is irra...

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Abstract

The invention discloses a device and method for detecting the inner wall of an engine cylinder based on digital holographic interferometry. The device comprises a dual-frequency laser, a beam expanding/collimating optical path, a beam splitting plate, a phase shifter, a conical surface reflecting mirror, a scanning motion device, a CCD camera and an upper computer. The optical principle, devices and optical path arrangement of the device are similar to those of a Tyman-Green interferometer. The device introduces the 90-degree conical reflecting mirror, so that a straight incident light beam isconverted into a radial light beam. The radial measurement light beam irradiates on the inner wall of an engine to be detected so as to form an annular light band, and the light band is a to-be-detected surface participating in the interference. The device drives the conical reflecting mirror to move in a straight line introducing the scanning motion device so as to complete the detection for thewhole inner wall. The device is high in measurement accuracy and good in real-time performance and meets a requirement of high efficiency of online detection. The device belongs to non-contact measurement and avoids scratches caused by a contact for the inner wall; and the device has the advantages of surface measurement, large measurement range, much measurement information and the like.

Description

technical field [0001] The invention belongs to the field of digital holographic interference measurement, in particular to a detection device and method for the inner wall of an engine cylinder based on digital holographic interference. Background technique [0002] At present, most passenger car engines are assembled by aluminum alloy cylinder blocks and cast iron cylinder sleeves to take into account the weight of the engine and the wear resistance of the inner wall of the cylinder. In order to further reduce the total weight of the engine and reduce the friction loss between the cylinder and the piston, researchers have proposed a new cylinder processing technology: inner wall spraying technology [1-4]. That is, molten cast iron is sprayed on the inner surface of the aluminum alloy cylinder block, and the coating is bored into the final cylinder inner wall. The thickness of the cast iron coating obtained by the inner wall spraying technology is roughly 100 microns to 20...

Claims

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Application Information

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IPC IPC(8): G01B11/24
CPCG01B11/2441
Inventor 汪连坡朱烨翟超顾永刚
Owner UNIV OF SCI & TECH OF CHINA
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