Last edited by Daibar
Sunday, May 3, 2020 | History

2 edition of Applications of acousto-optic filters in astronomical spectrophotometry. found in the catalog.

Applications of acousto-optic filters in astronomical spectrophotometry.

David Robert Halliwell

Applications of acousto-optic filters in astronomical spectrophotometry.

by David Robert Halliwell

  • 110 Want to read
  • 35 Currently reading

Published .
Written in English


Edition Notes

Thesis (Ph. D.)--The Queen"s University of Belfast, 1985.

The Physical Object
Pagination1 v
ID Numbers
Open LibraryOL19799227M

Acousto-optic tunable filters are useful for selecting specific wavelengths for excitation light in confocal and multiphoton fluorescence microscopy. The filter operates by establishing a radio-frequency standing acoustical wave in an appropriate crystal and creating, in effect, a bulk transmission diffraction grating. Acousto-optic tunable filters are powerful tools for spectroscopy, imaging, and WDM. Gupta traces the development of these devices and discusses current and future by:

In this paper we report for the first time the presence of bistability in an acoustic-optic tunable filter (AOTF) operating with ultrashort (2 ps) optical light pulses. The results for the study of bistability has shown the dependence of the hysteresis curve with the product of the coupling constant (κ) by the length of the device (ξL) and the conversion power-coupling constant factor (G).Cited by: 2. The radio astronomy group in Japan has chosen to bypass the traditional RF filter and auto-correlator backends in favor of the acousto-optic techniques for the 6-m millimeter wave telescope at the Tokyo Astronomical 0bservatoryl5. They have constructed their own Bragg modulators from bonding.

A compact, solid-state, high-resolution spectrometer consisting of an acousto-optic tunable filter (AOTF) and a fiber-optic Fabry{endash}Perot (FFP) interferometer has been developed. The system has been designed for high-resolution inductively coupled plasma atomic emission spectroscopy (ICP-AES. A prototype acousto-optic spectrometer which uses a discrete bulk acoustic wave Itek Bragg cell, 5 mW Helium Neon laser, and a element Reticon charge coupled photodiode array is described. The analog signals from the photodiode array are digitized, added, and stored in a very high speed custom built multiplexer board which allows synchronous detection of weak signals to be by: 2.


Share this book
You might also like
Publications of the Ontario Government 1901-1955

Publications of the Ontario Government 1901-1955

Southern California creates.

Southern California creates.

Southern leatherside (Lepidomeda aliciae) monitoring summary, statewide 2006-2008

Southern leatherside (Lepidomeda aliciae) monitoring summary, statewide 2006-2008

The new Robinson Crusoe

The new Robinson Crusoe

Guide.

Guide.

Wilson philological lectures on Sanskrit and the derived lanaguages [sic] delivered in 1877

Wilson philological lectures on Sanskrit and the derived lanaguages [sic] delivered in 1877

30% fat-- whats that?

30% fat-- whats that?

Reaffirming the immunity from taxation of preferred stock, capital notes and debentures of banks while owned by the Reconstruction Finance Corporation.

Reaffirming the immunity from taxation of preferred stock, capital notes and debentures of banks while owned by the Reconstruction Finance Corporation.

Chrome, vat and azoic dyestuffs on nylon textiles.

Chrome, vat and azoic dyestuffs on nylon textiles.

Ground-water development and the effects on ground-water levels and water quality in the town of Atherton, San Mateo County, California

Ground-water development and the effects on ground-water levels and water quality in the town of Atherton, San Mateo County, California

Musical bouquet

Musical bouquet

Statistical applications in the earth sciences

Statistical applications in the earth sciences

List of seminars, study groups, expert groups, symposia and workshops held under the United Nations auspices 1946-1969.

List of seminars, study groups, expert groups, symposia and workshops held under the United Nations auspices 1946-1969.

Solar flux atlas from 296 to 1300 nm

Solar flux atlas from 296 to 1300 nm

Applications of acousto-optic filters in astronomical spectrophotometry by David Robert Halliwell Download PDF EPUB FB2

Acousto-optic filters possess some attractive properties for applications to astronomical spectrophotometry. Tuning over a wide spectral range is achieved by variation of the frequency of an acoustic wave propagated through the crystal which causes diffraction of the incident collimated light in a narrow range of by: 2.

Acousto-optic filters possess some attractive properties for applications to astronomical spectrophotometry. Tuning over a wide spectral range is achieved by variation of the frequency of an acoustic wave propagated through the crystal which causes diffraction of the incident collimated light in a narrow range of wavelengths.

Spectral scanning either continuously through the spectrum or by. Acousto-optic filters are a very advantageous means for rapid, electronic wavelength control of ECLs.

The wavelength range of an AOTF is typically much broader than the gain bandwidth of an individual diode laser, so there are no wavelength range limitations imposed by the filter, in contrast to the case of electro-optic birefringent tuning.

Books. Publishing Support. Login. Acousto-Optic Tunable Filters (AOTFs) are electronically-controlled bandpass optical filters.

They are often preferred in applications in spectroscopy where their agility and rapid random-access tuning can be deployed to advantage. When used for spectral imaging a large aperture (typically 10mm or more) is Cited by: 1. The purpose of this investigation is to improve the study of the characteristics of noncollinear acousto-optic tunable filters (AOTFs) used in imaging spectroscopy.

Three filters were characterized and the results compared with tuning models to verify that device operation can be reliably predicted in advance.

All these devices use tellurium dioxide as the interaction medium and have large. Acousto-optic tunable filters are powerful tools for spectroscopy, imaging, and WDM. Gupta traces the development of these devices and discusses current and future applications. Acousto-optic tunable filters (AOTFs) are solid state wavelength tunable optical filters.

Modern AOTFs are constructed by attaching piezoelectric transducers to an appropriate crystalline material. By driving the transducers at the appropriate frequency, a series of perturbations traverse the by: Acousto-Optic Tunable Filters (AOTF) Acousto-optic tunable filters (AOTF) are used to rapidly and dynamically select a specific wavelength from a broadband or multi-line laser source.

As the applied RF frequency is varied, the transmitted wavelength changes, “tuning” the wavelength of the beam or image in tens of microseconds or less.

An acousto-optic modulator, also called a Bragg cell or an acousto-optic deflector, uses the acousto-optic effect to diffract and shift the frequency of light using sound waves.

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.

An oscillating electric signal drives the. In biochemistry, for example, it is used to determine enzyme-catalyzed reactions. In clinical applications, it is used to examine blood or tissues for clinical diagnosis. There are also several variations of the spectrophotometry such as atomic absorption spectrophotometry and atomic emission spectrophotometry.

What is A Spectrophotometer. A spectrophotometer can be located in many studies, biology, chemistry, and industrial laboratories. The spectrophotometer is utilized for research and data evaluation in different scientific fields.

Some of the major fields in which a spectrophotometer is employed are physics, molecular biology, chemistry, and biochemistry labs. Applications of Acousto-optic Tunable Filters A widespread application of AOTF is in multispectral imaging, e.g. in the form of laser microscopy.

The essential advantage of this technology is that very rapid scanning (e.g. compared with mechanically controlled spectrometers) is possible, allowing for a fast acquisition of microscope images with spectral information.

Journal of Astronomical Telescopes, Instruments, and Systems and new custom exploitation tools developed specifically for these applications. Imaging spectroscopy is particularly useful for non homogeneous samples or scenes.

examples include spatial classification based on spectral signatures, use of spectral libraries for material Cited by: The design of acoustooptic tunable filters is one of the most discussed problems in present acoustooptics because of a very wide area of the application of these devices in quantum electronics, spectrometry and spectropolarimetry, fluorescence spectroscopy.

The system is based on an acousto-optic tunable filter (AOTF) attached to a high-performance digital camera. The AOTF enables the selection of spectral bands with an rf signal in the range of Imaging spectrometer based on an acousto-optic tunable filter.

Review of Scientific Instruments69 (8), DOI: / Chieu D. Tran, Ricardo J. Furlan. Amplitude stabilization of a multiwavelength laser beam by an acousto-optic tunable by: Acousto-optic tunable filter The principle behind the operation of acousto-optic tunable filters is based on the wavelength of the diffracted light being dependent on the acoustic frequency.

By tuning the frequency of the acoustic wave, the desired wavelength of the optical wave can be diffracted acousto-optically. Farries M. Mid infra-red hyper-spectral imaging with bright super continuum source and fast acousto-optic tuneable filter for cytological applications ICOOPMA [8] Valle Ward Pannell Johnson S.

Acousto-Optic Tunable Filters (AOTFs) for imaging Applications in the μm range with Low RF Drive Power School on Acousto-Optics Cited by: 1.

Acousto optic devices create an optical grating in a crystal by means of acoustic waves and can thus be used to change direction, frequency and intensity of a laser beam.

The products available from AMS Technologies feature very high switching speed and excellent diffractive efficiency and thus maintain laser performance.

There is a need to develop large-aperture acousto-optic tunable filters (AOTFs) in the UV region for applications in astronomy, environmental sciences, biology, etc. Characterization of an Acousto-optic Tunable Filter and Use in Visible Spectrophotometry EWA G.

BUCHER and JON W. CARNAHAN* Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois The use of a paratellurite acousto-optic tunable ® lter (AOTF) is demonstrated as a monochromator for spectrophotometry. This de.Applications of acousto-optic filters in astronomical spectrophotometry Author: Halliwell, D.

R. ISNI: Awarding Body: Queen's University Current Institution: Queen's University Belfast Date of Award: Availability of Full Text.The acousto-optic tunable filter is an electro-optical device that functions as an electronically tunable excitation filter, and can simultaneously control the intensity and wavelength of multiple laser lines from one or more lasers.

The acousto-optic tunable filter is an electro-optical device that functions as an electronically tunable excitation filter, and can simultaneously control the.