Graduate Thesis Or Dissertation
 

Noncontact measurement of shaft torsional displacements by optical means

Public Deposited

Downloadable Content

Download PDF
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/3f462770q

Descriptions

Attribute NameValues
Creator
Abstract
  • An optical diagnostic system capable of measuring angular displacements in a torsionally loaded shaft through noncontact means has been developed. Conventional torsion diagnostic mechanisms must come in contact with the shaft to be analyzed. The signal-to-noise ratio response of conventional systems is compromised by dirt and wear. Another consequence of these devices is that the shaft being diagnosed must be cut in half to implement the mechanism. In this work, the shaft angle of twist (4) is measured utilizing precision optics and HeNe laser light. Accuracy in the placement and orientation of mirrors on the shaft surface is shown to be crucial, since precise bending of the laser light is require to effectively measure twisting distortions. A CdS photoresistor was augmented with a high gain operational amplifier for light sensing. This system was then implemented as the receiving source of optically measured torsional displacements. Experimental results confirm that the voltage response of the amplifier varies linearly with 4. It is shown that the amplifier output voltage varies as a function of the amount of optical energy received from the shaft reflected laser light. The amount of optical energy transmitted to the circuit is dependent on the angle of twist in the shaft. The system performs these tasks without any physical contact between the laser source, shaft, or the photocircuitry.
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Publisher
Peer Reviewed
Language
Digitization Specifications
  • PDF derivative scanned at 300 ppi (256 B&W), using Capture Perfect 3.0, on a Canon DR-9080C. CVista PdfCompressor 3.1 was used for pdf compression and textual OCR.
Replaces

Relationships

Parents:

This work has no parents.

In Collection:

Items

Thumbnail Title Date Uploaded Visibility Actions
file details Melendy_Robert_F_1994.pdf 2017-08-02 Public Download