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Research On Measuring Technology Of Surface Roughness By Fiber Probe

Posted on:2004-03-28Degree:MasterType:Thesis
Country:ChinaCandidate:X Y CengFull Text:PDF
GTID:2168360092986202Subject:Microelectronics and Solid State Electronics
Abstract/Summary:PDF Full Text Request
Surface roughness is an important concept in machining and determines the performance of machining surface. Therefore, surface roughness measurement is a important task of machine-building industry. The traditional probe instrument has its own advantages, but it can scratch the surface being measured by contacting it. This limits its application. Among those non-contact method, the light-scattered method is in common use. But it can only provide Stat. result, not the profile of surface.This paper focuses on developing a measuring technology of surface roughness by fiber probe. Let's see the measurement process: one beam of laser is shot at the surface vertically via a single mode fiber, then at the points of peaks and valleys of the surface profile, the laser will be reflect into the fiber and we will get a laser pulse at the other end of the fiber. If the laser did not shoot at the peaks or valleys, we will get nothing. So, if we scan the surface with the single mode fiber at a fixed height, we will receive a series of laser pulses which have different intensity. With these pulses, we can get back the surface profile. Using this technique, we can not only avoid to contact the surface but also get the surface profile. Much more detail of this technique is discussed in this paper, and result of measurement is given. Finally, further research directions are presented.In the development of prototype, the concept of virtual instruments is fetched in. Data is computed and displayed by instruments which consist of software. This makes the system can be easily extended. The system will be more flexible and transplantable.
Keywords/Search Tags:surface roughness, laser, intensity modulation, fiber, probe, coupling efficiency, virtual instruments
PDF Full Text Request
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