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Session Number 3226

Infrared Emitter – Detector Project Nghia T. Le Purdue University

I. Introduction

The following project is a design of an infrared emitter-detector circuit. It reviews of some of the concepts and applications the students have learned during the first few semesters in the Electrical Engineering Technology program at Purdue University. The advantage of this project is that it progresses in steps that are manageable and easily to conduct laboratory activities.

The project consists of an analog part and a digital part. An infrared light source is modulated at a frequency of 4 kHz and placed in front of a detector. The signal detected by the phototransistor is then processed through a series of analog circuits. The circuit indicates when the infrared beam is blocked. The block diagram of the analog part of the project is shown in Figure 1 below.

PASSIVE TRANSISTOR OSCILLATOR DC BIASING HIGHPASS AMPLIFIER DRIVER FILTER

INFRARED PHOTO- EMITTER TRANSISTOR

TO DIGITAL CIRCUIT

ACTIVE ACTIVE PEAK BANDPASS FULLWAVE COMPARATOR LIGHT EMITTING DIODE DETECTOR FILTER RECTIFIER

VOLTAGE REFERENCE

Figure 1 – Block Diagram of the Analog Part

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Le, N. T. (2000, June), Infrared Emitter Detector Project Paper presented at 2000 Annual Conference, St. Louis, Missouri. 10.18260/1-2--8456