Principle of laser interferometer job

The measurement below 03%) definition is very high, can amount to 1×10-7. Laser interferometer can cooperate all sorts of reflection lens, illuminator to wait come really linear position, speed, angle, smooth degree, spend continuously really, parallelism and verticality measure the job, can regard accurate tool as machine or the corrective job that measure an instrument. Interferometer of laser of Chan Pin of —— of laser interferometer principle pursues as follows, the working principle of interferometer of odd frequency laser: From the beam of light that laser gives out, classics enlarge bundle two are by spectroscopic cent after collimation, come back to assemble is on spectroscope and produce interference stripe from fixed illuminator and movable illuminator reflex respectively. When movable illuminator is mobile, the light intensity that interferes stripe changes by accept implement the changeover such as medium photoelectricity changeover component and electronic circuitry is electric pulse signal, via reversible tally is being inputted after plastic, enlarge computation gives total pulse to count, press the: in computational type style by the computer again? ?lambda; is the displacement of movable illuminator of cipher out of electric pulse gross to measure L for N of laser wavelengh 　 . When using interferometer of odd frequency laser, atmosphere is in steady state all round the requirement, all sorts of air onflow can cause dc n change and the influence measures an outcome. Interferometer of laser of Shuang Pin of —— of laser interferometer principle pursues as follows, the working principle of interferometer of double frequency laser: On helium neon laser, add on one about 0.

The axial magnetic field of 03 tesla. As a result of Zeeman dissension effect and frequency drawing effect, laser produces the Zun Xuan with two 2 different frequency and 1 dextral round polarized light. Classics 1/4 wave piece epigenesis is two mutual and perpendicular linear polarized light, it is two via spectroscopic cent again: Pass polarizer the referenced beam of light that 1 epigenesis is F1-f2 to contain frequency. Divide again after classics polarization is spectroscopic all the way it is two: Make the beam of light that contains F1 only all the way, another makes the beam of light that contains F2 only. When movable illuminator is mobile, the classics of beam of light that contains F2 makes the beam of light that contains F2 ±Δf after movable illuminator reflex, Δf is the add frequency that arises because of the Doppler effect when movable illuminator is mobile, sign represents mobile way (the Doppler effect is Austrian C.

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Duopuledi goes out, namely the frequency of wave is in wave source or accept implement) of change of generation of the meeting when motion. This beam of light and the polarizer of classics of beam of light that reflex the light that comes back to contain F1 only by fixed illuminator 2 hind assemble becomes those who be F1-(f2±Δf) to measure beam of light. Measure beam of light and the photoelectricity changeover component with respective classics of afore-mentioned referenced beam of light, amplifier, plastics implement junior decrease into subtracter photograph, output becomes the electric pulse signal that contains ±Δf only. Classics is reversible after tally computation, measure conversion into profession by the computer (grow by 1/2 laser wave) hind can reach the displacement of movable illuminator is measured. Applied frequency change will measure displacement measure interferometer of double frequency laser, information of this kind of displacement carries the frequency difference at F1 and F2 to go up, peaceful to the dc that causes by light intensity change change is not sensitive, interference rejection capability is so strong. It is commonly used the coordinate precision that measures machine, photoetching machine and machining center to wait at calibrating length measuring machine, 3 coordinate, also can use as 3 coordinate measure length measuring machine, high accuracy machine survey a system. Use corresponding accessory, still can undertake high accuracy linearity is measured, flatness is measured and small angle is measured. —— of laser interferometer principle applies where 　 Ⅰ : Of positional precision detect reach its automatic compensation can detect precision of fixed position of numerical control machine tool, repeat fixed position precision, minim displacement precision to wait. Ⅱ : Of precision of double axis fixed position detect reach its to compensate Leinishao automatically system of double laser interferometer can measure machine tool of numerical control of movable type of large dragon door with pacing, by the fixed position precision that axial of some of double servo drive moves, and still can pass RS232 interface, undertake automatically compensating respectively to error of two axes sex. Ⅲ : Performance of trends of numerical control machine tool detects use RENISHAW dynamic character to measure with evaluate software, usable laser interferometer undertakes test of machine tool vibration and analysis (FFT) , the dynamic character of ball guide screw is analysed, the response of servo drive system is characteristic analysis, the trends of slideway is characteristic (low speed is creeping) the analysis. Ⅳ : Geometrical precision detects can use at detecting linearity, verticality, a simple move or action and slant place, flatness, parallelism. Summary: Laser interferometer has interferometer of odd frequency laser and interferometer of double frequency laser two kinds, among them interferometer of odd frequency laser is stimulate beam of light through blasting off, have fixed wavelengh, fold returned laser bundle signal of pulse of translate into of will smooth signal, computation loses returned pulse sum total, be informed displacement distance through computation, wait for the measurement of length. CNC Milling CNC Machining