Passive IR sensor

 👋Hi, I have discussed about basic of Infrared. If you not seen it Click the below link  Introduction to IR Sensor. This blog talks about Passive IR sensor.

Let us start with basic example to known about Passive IR sensor.

We all Seen digital thermometer in hospital to measure the body temperature. Let us understand the working of Thermometer.

WORKING:

     The digital thermometer which uses photodiode which is sensitive to infrared light only and produce electrical signal depending on the amount of Infrared. Infrared light are scattered from body and we need to focus the infrared into the photodiode. The radiation focused on lens not only contains IR also other radiation were removed using filter. The electrical signal generated is directly proportional to heat of the object.

MEDICAL APPLICATION:

*Non contact temperature measurement

OTHER APPLICATION:

There is a sensor called PIR sensor for detecting motion. This is also work on same principle but it uses fresnel lense and also it check change in heat related to infrared used to measure motion of an object.

ADVANTAGES:

*Prevention from contamination 

*No need of mercury 

*Faster reading when compared to Analog thermometer


We will discuss of designing of product using Passive IR Sensor in upcoming post. Please comment your doubts and content you need. 

In next blog we will learn about the very basic ultrasonic sensor.

!!Let us gain knowledge and make a solution for problems!!

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