Honors College Thesis
 

Laser probe for the detection of surface acoustic waves

Público Deposited

Contenido Descargable

Descargar PDF
https://ir.library.oregonstate.edu/concern/honors_college_theses/rv042v97n

Descriptions

Attribute NameValues
Creator
Abstract
  • The Amplitude and phase of surface acoustic waves can be characterized using a laser beam and photodiode detector. This paper describes a technigue for charactarizing waves using the double photodiode method. This method is a modification of the knife-edge method, and involves focusing a laser beam to a beam spot smaller than the acoustic wavelength. The beam is reflected and the tilt of the reflection due to the surface acoustic wave is measured by a double photodiode. The laser beam chopped to the same frequency as the surface acoustic wave and amplitude modulation is applies in order for the photodiode to be able to detect the wave. The double photodiode measures the light shining on each half of the detector. The difference between signals from each half is then divided by the total signal and fed into a lock-amplifier that extracts the amplitude and phase information from the signal. The lock-in amplifier output signal can also be used to create 2D images of the surface acousitc wave using LabView or another similar program. The described method has been shown to be applicable to frequencies of 3GHz and will have a measured amplitude sensitivity of 1 andstrom.
License
Resource Type
Fecha Disponible
Fecha de Emisión
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Non-Academic Affiliation
Subject
Declaración de derechos
Publisher
Peer Reviewed
Language
File Format
File Extent
  • 21396216 bytes
Replaces

Relaciones

Parents:

This work has no parents.

En Collection:

Elementos

Miniatura Título Fecha de subida Visibilidad Acciones
file details THESIS_albers.pdf 2017-07-29 Público Descargar