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Std edition Solutions for Infrared Forhead Thermometer by JLCPCB

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Published Time: 2020-04-21 17:20:34
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forehead thermometer.jpg

JLCPCB:An infrared thermometer is a thermometer which infers temperature from a portion of the thermal radiation sometimes called black-body radiation emitted by the object being measured. They are sometimes called laser thermometers as a laser is used to help aim the thermometer, or non-contact thermometers or temperature guns, to describe the device's ability to measure temperature from a distance. By knowing the amount of infrared energy emitted by the object and its emissivity, the object's temperature can often be determined within a certain range of its actual temperature. Infrared thermometers are a subset of devices known as "thermal radiation thermometers".-wikipedia

1 Normal Human Body Temperature Medical research hasn't determined an exact correlation between oral, rectal, ear, armpit, and forehead temperature measurements. Generally, the correlation of temperature results are as follows:

The average normal oral temperature is 98.6°F (37°C).A rectal temperature is 0.5°F (0.3°C) to 1°F (0.6°C) higher than an oral temperature.An ear (tympanic) temperature is 0.5°F (0.3°C) to 1°F (0.6°C) higher than an oral temperature.An armpit (axillary) temperature is usually 0.5°F (0.3°C) to 1°F (0.6°C) lower than an oral temperature.A forehead (temporal) scanner is usually 0.5°F (0.3°C) to 1°F (0.6°C) lower than an oral temperature.

2 Solution for Infrared Forhead Thermometer

forehead thermometer.png

3 Thermopile Sensor

sensor.jpg The thermo sensor is the core of the Infrared forhead thermometer scheme. The principle is to utilize the Seebeck effect (also known as the first thermo effect).Generally, the operating temperature and sensitivity of thermopile sensors ranges from 5 ~ 90mV/℃.

4 MCU Processors

Since the sensitivity of thermopile sensor is 5 ~ 90mV/℃, the signal can be detected by MCU's AD and the corresponding temperature can be calculated.(if the sensitivity of the sensor is less than 1mV, it is can be amplified by the precision operational amplifier before being detected by the MCU).

5 Buzzar


When the human body temperature tested exceeds the normal value (37.3℃), the buzzar will beep indicating that the tested one's temperature is higher than the normal value

6 LED Display


When the temperature data of human body is collected by the sensor, it is transmitted to the MCU for calculation to remove environmental interference, and the collected temperature of human body needs to be displayed through the LCD screen.

7 Solution for PCB Design

schematic diagram.png jlcpcb.png JLCPCB2.png

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