How to read thermo gun sensor?

Other Hardware Sensors
1

Hello,
I need help to read a sensor from thermo gun, with arduino. It has 4 leg seldered to its original pcb :
TP+, TP-, GND, NTC

I tried to connect it to arduino
TP+ to 3,3v pin
TP- & GND to GND
NTC to analog A0
In serial monitor, the analog read range beetween 3-8.

Is my circuit correct?
How can i calibrate the sensor?

Thanks

2

Pardon my ignorance, but what is a "thermo gun" and what is the relevance to COVID 19?

3

Thermo gun is infra red thermometer, to measure human body temperature, especially in a forehead. In this covid era, commonly used in an entrance of office/market/etc. It has a shape of 'gun', with a trigger in it

4

Links, photos, datasheet, specifications, please.

5

Hello guys,
maybe ritza_lee means something like the next photos :
,
and ,
.
And next photos show what's inside and type (maybe , maybe not true) of sensor which measures the temperature :



I hope this info helps a small, but I have made and some more measurements over pins of sensor, and I was kindly dissappointed:
there is something like bridge measurements used in this schematic, but only 62,7mV to 63,4mV is the difference between TR+ and TR- for couple of degrees change in front of sensor (including lenses for focus). No voltage is between TP+ and TR- ....

6

Photos aren't showing up.

IIRC those work by measuring the peak wavelength of IR light they see? (whhich in turn is dependent on the temperature of the emitting object)

Those things are mostly performance anyway. Most of the time the person using it doesn't hold it at the right distance, and at the time of admission into the hospital, less than half of covid patiens have a fever anyway.

7

This sensor is a Chinese IR contactless sensor and works with differential voltage output, so you will need to connect the outputs to an AmpOP in order to get the differential values, mV scale. This sensor is very difficult to employ due to lack of technical stuff, so you might try to use a different sensor like MLX90614DCI (if the main purpose is measure human body temperature). Don´t use the cheaper version without the optical adaptor, the FOV angle is too wide and you will get random values.