Masters Theses


"There are many situations in which it is desirable to know the speed of the shaft and the torque it is transmitting, when it is equally undesirable to make any mechanical connection to the shaft. This thesis describes the development and design of a device for measuring the torque and speed by photo-electric means. The basic principle is that a light beam parallel to the shaft may be used to pick up the desired information without adding friction to the system. The deflection of a torque tube inserted in the shaft opens or closes a set of apertures arranged in a circle concentric with the shaft. A beam from a light source is directed parallel to the shaft and focused on a light sensor through the apertures. As the shaft rotates, a flickering light reaches the light sensor. The size of the apertures depends on the torque, the average light intensity reaching the light sensor is a measure of the torque. The frequency of the light fluctuations is a measure of the speed. The design of the torque tube and variable-aperture assembly is discussed. The design of the electronic circuits which convert the light sensor output into signals proportional to speed and torque is shown in detail"--Abstract, page ii.


McPherson, George, 1921-2017

Committee Member(s)

Johnson, Charles A.
Hord, William Eugene
Rhea, L. G.


Electrical and Computer Engineering

Degree Name

M.S. in Electrical Engineering


University of Missouri at Rolla

Publication Date



ix, 71 pages


© 1965 Raojibhai A. Patel, All rights reserved.

Document Type

Thesis - Open Access

File Type




Subject Headings

Photoelectric measurements
Speed -- Measurement
Torque -- Measurement

Thesis Number

T 1751

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