Ir sensor
- 1. GOVERNMENT COLLEGE OF ENGINEERING & TECHNOLOGY Active Learning Assignment Subject :- Mechatronics Topic: INFRARED SENSOR Prepared by : RAJVEER PARIHAR
- 2. TOPICS ▪ WHAT IS IR SENSOR ▪ IR SENSOR STRUCTURE ▪ PRINCIPLE OF OPERATION ▪ KEY ELEMENTS OF IR DETECTION SYSTEM ▪ IR SENSOR WORKING ▪ APPLICATION ▪ PROS AND CONS
- 3. WHAT IS IR SENSOR • An infrared sensor is an electronic instrument which is used to sense certain characteristics of its surrounding by either emitting and/or detecting motion. • Infrared sensors are also capable of measuring the heat being emitted by an object and detecting motion. • Infrared waves are not visible to human eye. In the electromagnetic spectrum, infrared radiations can be found between the visible and microwave regions. • The Infrared waves typically have wavelengths range from 780nm to 1mm
- 6. PRINCIPLE OF OPERATION IR LED KEEPS TRANSMITTING INFRARED RAYS UP TO SOME RANGE. WHEN SOME OBJECTS COMES IN THE IR RANGE THE IR WAVE HITS THE OBJECT AND COMES BACK AT SOME ANGLE THE PHOTODIODE NEXT TO IR LED DETECTS THE IR RAYS WHICH GOT REFLECTED FROM THE OBJECT. No object present- no IR detected by sensor Object present- reflected IR light detected by sensor
- 7. KEY ELEMENTS OF IR DETECTION SYSTEM ► IR TRANSMITTER IR transmitter acts as an open source for IR radiation.in most cases infrared laser, LEDs of infrared wavelength are used as sources ► TRANSMISSION MEDIUM Transmission medium provides passage for radiation to reach from IR transmitter to IR receiver. Vacuum, atmosphere and optical fibers are used as medium ► IR RECIVER Generally IR receiver are photo diode and photo transistor. They are capable of detecting IR radiation
- 9. APPLICATION ► PROXIMITY SENSOR ► ITEM COUNTER ► BURGLAR ALARM ► RADIATION THERMOMRETER ► HUMAN BODY DETECTION ► GAS ANALYZERS ► NIGHT VISION GLASSES ► FLAME MONITORS
- 10. PROS AND CONS ADVANTAGES: ► LOW POWER REQUIREMENT ► SIMPLE CIRCUITERRY ► DIRECTION BEAM ► HIGH NOISE IMMUNITY DISADVANTAGES: ► LINE OF SIGHT REQUIREMENT ► BLOCKED BY COMMON OBJECTS ► SHORT RANGE ► EASILY AFFECTED BY PHYSICAL ENVIRONMENT
- 11. THANK YOU