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07.31.11
by atifsheikh
INFRARED(IR) TRANSMITTER(TX) AND RECEIVER(RX) : IR pair is an electronic device which consists of two parts i) Transmitter and ii) Receiver. Transmitter is used to transmits or emit the INFRARED rays and the receiver is used simply to receive these radiations . Sounds simple and easy :). Transmitter is often known as IR LEDand the Receiver
as IR Sensor.
HOW TO DISTINGUISH BETWEEN THESE TWO ? * Connect cathode of one LED to +ve terminal of DMM * Connect anode of the same LED to common terminal of DMM (means connect LED such that It gets reverse biasedby DMM )
* Set DMM to measure resistance upto 2M Ohm. * Check the reading. * Repeat above procedure with second LED. * In above process, when you get the reading of the few hundred Kilo Ohms on DMM, then it indicated that LED that you are testing is IRsensor . In case of
IR transmitter DMM will not show any reading. SIMPLE TESTING CIRCUIT: Make connections as shown in the schematic below. IR pair Test Circuit The pair should face each other in an Head to Head manner and thedistance b/w these
should be as minimum as possible , but please make sure that there should be a small clearance b/w pair. OBSERVE THE FOLLOWING: * When there is no obstacle b/w the two the RED LED will startglowing.
* When there is an obstacle b/w the two the RED LED will stopglowing.
CONCLUSION:
* In the case , when the Infrared is reaching the receiver (Rx), the Rx would show the minimum resistance, ideally it could be Zero Ohms (or Short Circuit ). * In the case , when there is an Opaque obstacle (say Black Plastic Piece or the faces of the Pair are rotated) b/w the two , and the Infrared is not reaching the receiver (Rx), the Rx would show the maximum resistance, in the range of few Mega Ohms , Ideally could be Infinite Resistance (or Open Circuit).SHARE THIS:
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2 THOUGHTS ON “INFRARED(IR) TRANSMITTER(TX) AND RECEIVER(RX) :”*
Ahmed Suliman
October 19, 2012
4:41 pm
Thankful for Your this information I would talk about a little something , How if The detector through launching the Electromagnetic ir and its not detect object what can I do , what is the solutions forthe black objects
Reply
*
atifsheikh
October 21, 2012
4:20 am
Mr. Ahmed: take Rx as a transistor (BJT-Npn) when light falls on its head (base) transistor gets short circuit; else it is open circuit. So if you want to detect dark/black objects use common emitter configuration for RX; If you need more help; I can provide you schematic.Reply
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