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Tuesday, April 21, 2020 | History

2 edition of Processing of laser interferometric signals for small displacement measurements found in the catalog.

Processing of laser interferometric signals for small displacement measurements

Gwo-sheng Peng

Processing of laser interferometric signals for small displacement measurements

  • 312 Want to read
  • 38 Currently reading

Published .
Written in English

    Subjects:
  • Laser interferometers.,
  • Interferometry.,
  • Signal processing -- Mathematics.

  • Edition Notes

    Statementby Gwo-sheng Peng.
    The Physical Object
    Pagination173 leaves, bound :
    Number of Pages173
    ID Numbers
    Open LibraryOL15296462M

    CHAPTER 21 INTERFEROMETERS P. Hariharan Di y ision of Applied Physics CSIRO Sydney, Australia 2 1. 1 GLOSSARY A area C ratio of peaks to valleys d thickness F finesse FSR free spectral range I intensity J i () Bessel function L fiber length m integer N number of fringes p optical path dif ference R reflectance r radius T transmittance l s synthetic wavelength θ angle É frequencyFile Size: 2MB.   The laser beam drift seriously influences the accuracy of straightness or displacement measurement in laser interferometers, especially for the long travel measurement. To solve this problem, a heterodyne straightness and displacement measuring interferometer with laser beam drift compensation is by: 7. Thrust Measurements Using Laser Interferometry Edward A. Cubbin Ap on small spacecraft with available power levels less than W. This device is An optical interferometric proximeter system (IPS) was designed to meet these needs (see . The extension of multi-telescope interferometry and aperture synthesis to infrared and optical wavelengths will enable in this decade significant progress in stellar and galactic physics, and will lead to great interferometric infrared/optical arrays of the future. The real-time correction of.


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Processing of laser interferometric signals for small displacement measurements by Gwo-sheng Peng Download PDF EPUB FB2

Graduation date: Algorithms for analyzing laser interferometry\ud signals were developed and adopted to the computer based\ud processing of small displacement measurements.

These\ud methods, matrix operation approach and fixed parameters\ud approach, are based on signal phase calculation and are\ud able to replace complex fringe counting.

Interferometry is a family of techniques in which waves, usually electromagnetic waves, are superimposed, causing the phenomenon of interference, which is used to extract information. Interferometry is an important investigative technique in the fields of astronomy, fiber optics, engineering metrology, optical metrology, oceanography, seismology, spectroscopy (and its applications to.

A LASER INTERFEROMETRIC SYSTEM FOR LOCAL STRAIN MEASUREMENTS WITH NANOMETER RESOLUTION, ER ',ER Institute of Electrical Engineering and Electrical Measurement, Technical University Graz, A Graz, Kopernikusgasse 24 Institute of Physical Chemistry, University Vienna, A Vienna, Wahringerstrafie 42 Institute of Cited by: 1.

Request PDF | Signal Reconstruction from Interferometric Measurements under Sensing Constraints | This paper develops a unifying framework for signal reconstruction from interferometric.

Interferometry applied. In order to generate an interference pattern with high precision (distinct fringes), it is very important to have a single highly stable wavelength source, which is achieved using the XL laser.

There are different interferometer set up's based on Michelson's principle, however, the linear set up is the simplest type to explain. Highlights We investigated a novel optical sensor for non-incremental displacement measurement. It measures fast moving solid state objects with rough surfaces.

Experimentally, a measurement uncertainty of nm was obtained. This uncertainty is in principle independent of the object by: 8. Application of Fourier analysis to the laser based interferometric strain/displacement gage Article (PDF Available) in Experimental Mechanics 42(2) June with 94 Reads.

Laser Interferometric Displacement Measurements []/ Figure 2. a) Electrode geometry of a typical multi-layer actuator with an ineffective volume at the device edges (typically mm). b) Optical microscope image of actuator layers. the model, as observed by optical microscopy of the multi layer actuator tested in this work (Fig.

Laser interferometric Sensing Techniques for Very Small laser. A displacement sensitivity close to m/.Jllz at kHz frequen measurements, the test masses can be suspended to give two mutually perpendicular baselines in which the gravitational wave signal will induce a differential displacement.

Most commercial FT spectrometers today use HeNe-laser interferometers as position are two types of laser interferometers: homodyne and heterodyne.A homodyne interferometer uses a single-frequency laser source, whereas a heterodyne interferometer uses a laser source with two close frequencies.

The homodyne interferometer using a HeNe laser as its source is a commonly used. displacement based on the principle of Michelson Interferometer [7] as shown in Fig The light source is a 5-mW laser diode at the wavelength λ= nm.

A lens is used to increase the laser divergence and the surfaces are made of aluminum plates. The scattering angle is typically wide, such surfacesFile Size: 1MB. All calibration systems are based on the Excel Laser.

This laser’s wavelength is traceable to NIST, via an in-house standard at Excel, to ensure the most accurate measurements. The A is a complete set which can make all measurements, comprised of 1 Laser head, 1 File Size: 1MB.

The measurement of small displacements on the nanometric scale demands metrological systems of high accuracy and precision. In this context, interferometer-based displacement measurements have become the main tools used for traceable dimensional metrology.

The different industrial applications in which small displacement measurements are employed requires the use of online measurements, Cited by: 7. Laser interferometer position measurement systems provide ultra-precise position or distance information for dimensional measurements or motion control.

As European distributor for Keysight Technologies (formerly known as Agilent) we offer a variety of high-quality industry-leading solutions ideal for. Laser interferometry is one of the most sensitive methods for small displacement measurement for scientific and industrial applications, whose wide diffusion in very different fields is due not only to the high sensitivity and reliability of laser interferometric techniques, but also to the availability of not expensive optical components and high quality low-cost laser sources.

This Field Guide provides a practical treatment of the fundamental theory of displacement measuring interferometry, with examples of interferometry systems and uses. It outlines alignment techniques for optical components, signal processing systems for phase measurements, and laser stabilization for homodyne and heterodyne sources.

Optics and Laser Heads for Laser-Interferometer Positioning Systems. Keysight Laser interferometer position measurement systems provide very precise position or distance information for dimensional measurements or motion control. We offers a variety of industry-leading solutions in laser interferometer products that are ideal for.

In this paper, we propose a novel type of miniature interferometer for displacement measurements over long ranges based on a low-cost laser source with a moderate coherence length.

Measurement beyond the coherence length is enabled thanks to a high-speed digital signal processing implemented in an embedded electronic system. In addition. device, a Laser Doppler Displacement Meter (LDDM™) has been developed.1 This device is an electro-optical assembly, which uses the Doppler shift of a laser frequency caused by the movement of a target to measure displacement accurately over a range of a few meters.

As shown in Figure 1, the LDDM consists of a laser head, a retro-reflector, a. @article{osti_, title = {An Innovative Transponder-Based Interferometric Radar for Vibration Measurements}, author = {Coppi, F and Cerutti, A and Farina, P and De Pasquale, G and Novembrini, G}, abstractNote = {Ground-based radar interferometry has recently emerged as an innovative technology of remote sensing, able to accurately measure the static or dynamic displacement of.

The first kind of interference fringes is usual e.g. for linear displacement measurement, the second one concerns the problems of lens centering and interferometer alignment.

The autoconvolution method was realized by interferometric signal processing in Cited by: 1. range enabled the use of distributed feedback laser diodes as an interferometer light source and a fast 20 ms wavelength scanning time by injection current control.

We demonstrated a measurement range of up to m and an accuracy better than nm in comparison with a displacement measurement interferometer, corresponding toCited by: 1. Glover A R, Skippon S M and Boyle R D Interferometric laser imaging for droplet sizing: a method for droplet-size measurement in sparse spray systems Appl.

Opt. 34 Crossref Hess C F Planar particle image analyzer Proc. 9th. This is the second year of a Phase II Small Business Innovation Research (SBIR) contract geared towards the development of a new seismic sensor. Ground-based seismic monitoring systems have proven to be very capable in identifying nuclear tests, and can.

Information Contents of a Signal at Repeated Positioning Measurements of the Coordinate Measuring Machine (CMM) by Laser Interferometer Tomáš Stejskal 1, Tatiana Kelemenová 2, Miroslav Dovica 2, Peter Demeč 1, Miroslav Štofa 1 1 Technical University of Košice, Faculty of Mechanical Engineering, Department of Production Technique, Letná 9.

Distance variations are monitored using highest sensitivity laser interferometric techniques with a strain sensitivity Δl/l below for frequencies around Hz. LIGO is operating in the frequency band 10 Hz to 10 kHz where the low-frequency limit is mainly given by displacement noise from seismic motion.

In high-accuracy dimensional measurements by laser interferometry, one of the largest correc-tions required is due to diffraction. Examples are the measurements of Si lattice-parameter by combined X-ray and optical interferometry [1–4], of gravity by free-fall gravimeters [5–7], and of diameters by Fizeau interferometers [8–13].Cited by: 5.

Therefore, small sensor systems are necessary whose measuring range, resolution, precision and measuring speed can be adapted because of their modular structure.

This paper presents a miniature laser-interferometric measuring system designed for making precision measurements in the field of microtechnology, nanotechnology, and macrotechnology. A grating interferometer based on the wavelength-modulated phase-shifting method for displacement measurements is proposed.

A laser beam with sequential phase shifting can be accomplished using a wavelength-modulated light passing through an unequal-path-length optical configuration. The optical phase of the moving grating is measured by the wavelength-modulated phase-shifting technique and.

A full-field, time-resolved interferometric method for the characterization of sparse, polydisperse spray systems is reported. The method makes use of the angular intensity oscillations in the wide-angle forward-scatter region. A pulsed laser is used to illuminate a planar sheet through the spray, which is imaged, out of focus, from the 45° direction.

GIULIANI AND NORGIA: LASER DIODE LINEWIDTH MEASUREMENT BY SELF-MIXING INTERFEROMETRY Fig. Self-mixing signal waveform with phase noise, sampled by a digitizing oscilloscope that acquires one point at each trigger pulse.

The trigger signal is the sinusoidal waveform imposed on the target. The arrows indicate the. Laser Tracker Compensation Using Displacement Interferometry Daniel S. Sawyer, Charles, Fronczek National Institute of Standards and Technology Introduction Laser trackers have become the tool of choice for large-scale coordinate measuring needs.

The requirement to rapidly validate the performance of these instruments to ensure the integrity of. Laser sensors can be used to measure distances to objects and their related parameters (displacements, position, surface profiles and velocities).

Laser sensors are based on many different optical techniques, such as triangulation, time-of-flight, confocal and interferometric sensors.

As laser sensor technology has improved, the size and cost of sensors have decreased, which has led to the Cited by: 4. Interferometric studies of lateral and axial displacements of an object using In axial displacement, an interferometer that is 3 Keprt J & Bartonek L, Measurement of small deformations by laser speckle interferometry, Physic, A38 () Displacement laser interferometry with sub-nanometer uncertainty Citation for published version (APA): Cosijns, S.

Displacement laser interferometry with sub-nanometer by: Use of Electronic Speckle Pattern Interferometry in Fluid Physics (With 5 Figures).- 5 Processing of Speckle Interferometric Signals and Fringe Patterns.- Image Processing Approach.- A Scale Independent Algorithm for the Detection of Fault Indicating Structures in Range Images (With 7 Figures) 4 A Primer on Displacement Measuring Interferometers A DMI uses the physical phenomenon of interference of light to measure displacement, i.e., how far something moves.

The measurement is relative, not absolute, so the more common name of “distance measuring interferometer” is a misnomer. DMI’s offer the most accurate andFile Size: KB. Ø Another major function is to determine range - laser range finder.

Laser altimeter is a special laser range finder. q A good reference for laser rangefinding techniques is a paper collection book -- “Selected Papers on Laser Distance Measurements”, edited by Brian J. Thompson, SPIE Milestone Series, Our textbook Chapter 8File Size: 2MB.

The purpose of this lab is for you to learn about the physics of laser interferometry and the science of precision measurements, and for you to gain some laboratory experience with optics and electronic test equipment along the way.

You will build and align a small laser interferometer in the Ph3 lab, you will determine how accurately you can. The present invention is directed toward an interferometric sensor that permits the simultaneous measurement of a change in more than one environmental condition.

The interferometric sensor comprises an optical fiber and a plurality of sensing regions positioned in an operable relationship to the optical fiber.

Each sensing region has partially reflective boundaries and produces an Cited by:. system, capable of measuring displacement, velocity, angular (pitch and yaw) displacement, flatness, straightness, parallelism and squareness, depending on the measurement kits supplied. A typical system set-up for measuring linear position is shown in Figure 4.

Table 1. Technical characteristics of ML10 laser Laser source HeNe laser tube File Size: KB.Typically, laser Fizeau interferometric measurements are concerned with low frequency figure errors. The optics in high powered laser systems, however, must be free from periodic structures of up to 8 lines/mm.

Such structures may cause small ripple amplification and lead to poor performance and system damage.'.Pratt & Whitney laser-based measuring systems use laser interferometers to deliver exceptional precision and accuracy. With instrument uncertainty to 2 millionths of an inch (50 nanometers), the Labmaster Universal Model is the most widely used dimensional interferometer in industry today.