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Monday, July 27, 2020 | History

4 edition of [Delta]k lidar design using an acousto-optic modulator found in the catalog.

[Delta]k lidar design using an acousto-optic modulator

[Delta]k lidar design using an acousto-optic modulator

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Published by U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, Environmental Technology Laboratory, For sale by the National Technical Information Service in Boulder, Colo, Springfield, VA .
Written in English

    Subjects:
  • Optical radar

  • Edition Notes

    Other titlesK lidar design using an acousto-optic modulator.
    StatementJames H. Churnside, Joseph A. Shaw, James J. Wilson.
    SeriesNOAA technical memorandum ERL ETL -- 252.
    ContributionsShaw, Joseph A., Wilson, James J., Environmental Technology Laboratory (Environmental Research Laboratories)
    The Physical Object
    FormatMicroform
    Paginationiii, 13 p.
    Number of Pages13
    ID Numbers
    Open LibraryOL17791144M
    OCLC/WorldCa32896971

    For acousto-optic modulators (AOMs), the principal performance parameter is the modulation speed which is primarily determined by the transit time, t. The transit time, t, and the rise time, t r, are given by: t-V/d and t r =t. To obtain a high modulation speed, t should be as small as possible. The acousto-optic modulator can be used to. Basic Ideas of Lidar Design The key of lidar design is the understanding of physical interactions and processes involved, the lidar simulations, and the choices of lidar type, configuration, arrangement, hardware and software to meet the measurement goals File Size: 1MB.

    Design of a double-pass shear mode acousto-optic modulator Chih-Hao Chang,1,a R. K. Heilmann,1 M. L. Schattenburg,1 and P. Glenn2 1Space Nanotechnology Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts , USA 2Bauer Associates, Inc., 8 Tech Circle, Natick, Massachusetts , USA Received 26 November ; accepted 16 February ; published . USB2 US09/, USA USB2 US B2 US B2 US B2 US A US A US A US B2 US B2 US B2 AuthorityCited by:

      The optical design comprises the photometrical calculation, the modeling of the image formation and the optimization of the optical system. This is also true for lidar and leads to specific aspects in the optical design for lidar. The lidar-equation is corrected for near distances, and it is shown that there is a difference between the Author: Wolfgang Richter. Summary data report [microform]: lidar cruise of the R/V David Starr Jordan / James H. Churnside, James J. Wilson, Todd A. Oja U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, Environmental Technology Laboratory ; For sale by the National Technical Information Service Boulder.


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[Delta]k lidar design using an acousto-optic modulator Download PDF EPUB FB2

[Delta]k lidar design using an acousto-optic modulator [microform] / James H. Churnside, Joseph A. Shaw, James J. Wilson U.S. Dept. of Commerce, National Oceanic and Atmospheric Administration, Environmental Research Laboratories, Environmental Technology Laboratory ; For sale by the National Technical Information Service Boulder, Colo.

Get this from a library. [Delta]k lidar design using an acousto-optic modulator. [James H Churnside; Joseph A Shaw; James J Wilson; Environmental Technology. This work offers detailed discussions on all aspects of acousto-optic deflectors, modulators and tunable filters, emphasizing hands-on procedures for design, fabrication and testing.

It contains previously unpublished treatments of acousto-optic device design and impedance matching, permitting the actual design of real devices and device-matching circuits. We discuss the design and operation of a new acousto-optic frequency shifter which eliminates these errors.

The laser is locked to one of the hyperfme lines near the D 2a peak and then frequency shifted by ± MHz by the acousto-optic modulator. This approach Cited by: 1. Introduction to Acousto-optic Modulators by Olen Rambow September Contents 1. How an AOM Works 2. Considerations for Using an AOM 3.

Accessories and Operation. How an AOM Works •An AOM is a crystal connected to a piezoelectric Size: KB. A Guide to Acousto-Optic Modulators D. McCarron December 7, 1 Introduction Acousto-optic modulators (AOMs) are useful devices which allow the fre-quency, intensity and direction of a laser beam to be modulated.

Within these devices incoming light Bragg di racts o acoustic wavefronts which propagate through a crystal. APPLICATIONS OF ACOUSTO-OPTIC MODULATORS: Acousto-optic modulators can perform other tasks in modulating the laser beam in addition to digital and analog modulation.

By careful design, a special class of Acousto [Delta]k lidar design using an acousto-optic modulator book modulators can be made that modulate more than one wavelength at a time.

This will be discussed is the followingFile Size: KB. Acousto-Optic application note – modulator model series This data sheet is issued to provide outline information only and Crystal Technology, Inc.

reserves the right to alter without notice the specifications, design, price or conditions of supply of this product. DOA 01/06 Crystal Technology’s (CTI) acoustic-opticFile Size: KB. Acousto-optic devices A schematic drawing of an acousto-optic modulator is shown in Fig.

A rf signal is fed to a strain transducer in contact with the AOM crystal. The rf modulation at fre-quency V causes a traveling density wave to form inside the crystal; the wave propagates at the speed of sound in the crystal, vs, with the frequency V.

An acousto-optic modulator (AOM), also called a Bragg cell, uses the acousto-optic effect to diffract and shift the frequency of light using sound waves (usually at radio-frequency).They are used in lasers for Q-switching, telecommunications for signal modulation, and in spectroscopy for frequency control.

A piezoelectric transducer is attached to a material such as glass. A frequency-modulated continuous-wave (FMCW) lidar is demonstrated with heterodyne detection.

The lidar transmitter utilizes an electro-optic I/Q modulator for the first time to generate carrier-suppressed and frequency-shifted FM modulation.

This eliminates the need for an acousto-optic frequency shifter commonly used in heterodyne lidar transmitters. It also allows the use of a much wider. Select up to three search categories and corresponding keywords using the fields to the right.

[Delta]k lidar design using an acousto-optic modulator. Published Date: K lidar design using an acousto-optic modulator Personal Author: Churnside, James. Our acousto-optic modulators are optimized for low scatter and high laser damage threshold. Rise time, modulation rate, beam diameter, and power handling needs of the application need to be understood in order to identify the best acousto-optic modulator and RF driver solution.

We also offer fiber-coupled acousto-optic modulators. An acousto-optic modulator (AOM) is a device which can be used for controlling the power of a laser beam with an electrical drive signal.

It is based on the acousto-optic effect, i.e. the modification of the refractive index of some crystal or glass material by the oscillating mechanical strain of a sound wave (photoelastic effect). acousto-optic physical principles - main equations An RF signal applied to a piezo-electric transducer, bonded to a suitable crystal, will generate an acoustic wave.

This acts like a “phase grating”, traveling through the crystal at the acoustic velocity of the material and with an acoustic wavelength dependent on the frequency of the RF.

ACOUSTO-OPTIC HISTORY. Brillouin predicted the light diffraction by an acoustic wave, being propagated in a medium of interaction, in InDebye and Sears, Lucas and Biquard carried out the first experimentations to check the phenomena.

The particular case of diffraction on the first order, under a certain angle of incidence, (also predicted by Brillouin), has been observed by Rytow. The Brimrose free space Acousto-Optic Modulator (AOM) with RF driver is used to vary and control laser beam intensity.

It is electronically programmable using a microprocessor connected to the Brimrose RF driver unit. The RF driver features all the necessary components to drive the modulator with analog or digital input control.

Acoustooptic In-Fiber Modulator Using Acoustic Focusing. We present the design, construction and performance of a number of all-fiber and fiber compatible acousto-optic modulators that. Frequency-modulated continuous-wave lidar using I∕Q modulator for simplified heterodyne detection S. Gao1,2 and R.

Hui1,* 1Department of Electrical Engineering and Computer Science, University of Kansas, Lawrence, Kansas USA 2Department of Electronic Engineering and Information Science, University of Science and Technology of China, Hefei, Anhui,China.

Highlights We demonstrate the viability of a novel 2D IR spectrometer that uses a dual Ge acousto-optic modulator (AOM). The spectrometer uses a single pixel MCT detector rather than an array detector.

The use of a dual AOM permits ways of scanning 2D IR spectra not previously possible. We compare data collection with a single pixel MCT detector to an array detector at 5 and 6 μm.

We find Cited by:. See K(B) trace [K(Q) is a function of the Q-factor, explained further below ] Design Considerations The operating wavelength, modulation frequency and optical power density dictate the AO design parameters.

These must also satisfy the Bragg criteria. A measure of .use with Isomet acousto -optic modulators and Q -switches, operating at a fixed centre frequency. The driver accepts two modulation signals ; digital (On:Off) and analogue (proportional) at baseband “video” frequency and provides a double-sideband amplitude modulated RF output to the acousto-optic modulator.OPTICS LETTERS / Vol.

30, No. 2 / Janu and the field of the acoustic wave in the first acousto-optic crystal is A 1 A 10 exp i KX 2Vt 1F 1. (2) Inside the crystal, the density (and.