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Project Description:
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In today’s episode, you will learn how to make a contactless Temperature monitoring system using MLX90614 non-contact infrared temperature sensor, Arduino, and SSD1306 i2c supported Oled display module. This is the Gravity I2C supported Non-contact IR Temperature sensor which I recently got from the DFrobot. This is a medical-grade Non-contact temperature sensor and offers an accuracy of ±0.2˚C in a limited temperature range around the Human body temperature.

As a standard, the MLX90614 is calibrated for an object emissivity of 1. I have seen guys completely ignoring the emissivity value when using the MLX90614 infrared temperature sensor. Let me first explain what is Emissivity and then I will practically explain what happens when you ignore the Emissivity value.

Emissivity:

Emissivity is a measure of the efficiency in which a surface emits thermal energy. It is defined as the fraction of energy being emitted relative to that emitted by a thermally black surface or a black body. A black body is a material that is a perfect emitter of heat energy and has an emissivity value of 1. A material with an emissivity value of 0 would be considered a perfect thermal mirror.

For example, if an object had the potential to emit 100 units of energy but only emits 90 units in the real world, then that object would have an emissivity value of 0.90. In the real world, there are no perfect "black bodies" and very few perfect infrared mirrors so most objects have an emissivity between 0 and 1.

Different objects have different emissivity values and when you ignore the emissivity value then you will end up getting the wrong temperature readings. As I said earlier, as a standard, the MLX90614 is calibrated for an object emissivity of 1. So, let’s say if you want to measure the temperature of a human body then you will need to recalibrate your MLX90614 non-contact infrared temperature sensor. Let me practically show you.



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MLX90614 non-contact infrared temperature sensor
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