Keywords

Optical chopper modulation, Microprocessor-based signal sampling, Analog signal amplification and filtering, Infrared focusing optics, Intrusion detection system design

Abstract

The purpose of this paper is to describe a device that passively detects the presence of a warm-bodied object in a specified area. The detecting device used is a pyroelectric detector with an integral optical filter. By focusing infrared radiation generated by the object onto the detector, the resulting temperature change is converted to a voltage and then amplified. Modulation of the incoming radiation is accomplished by a rotating disk whose speed of rotation is dynamically controlled by a microprocessor. The resulting detector response is filtered and converted to a DC level. The signal is then passed through an analog-to-digital converter and sampled by the microprocessor.

Notes

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Graduation Date

1987

Semester

Summer

Advisor

Martin, Robert J.

Degree

Master of Science (M.S.)

College

College of Engineering

Format

PDF

Pages

49 pages

Language

English

Rights

Public Domain

Length of Campus-only Access

None

Access Status

Doctoral Dissertation (Open Access)

Identifier

DP0021495

Subjects

Pyroelectric detectors; Motion detectors; Infrared detectors--Design and construction; Detectors--Data processing; Detectors--Design and construction

Accessibility Status

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