A brief introduction to the distance, temperature measurement application, and precautions of human

From: Shanghai Zhengqianwang  Date:2018-06-05 18:09:21  Hits:773  Belong to:company news
Choose different infrared thermopile probes according to different installation distances of human infrared thermometer
Human infrared thermopile probes can be divided into three types:
• Near infrared (NIR): 0.7 ~ 2 um
• Mid-infrared Mid-infrared (MIR): 3 ~ 5 um
• Far infrared (FIR): 8 ~ 14 um
Choose different infrared thermopile probes according to different installation distances of human infrared thermometer
Human infrared thermopile probes can be divided into three types:
• Near infrared (NIR): 0.7 ~ 2 um
• Mid-infrared Mid-infrared (MIR): 3 ~ 5 um
• Far infrared (FIR): 8 ~ 14 um
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Emissivity refers to the ability of an object to emit infrared light. Emissivity refers to the ability of an object to emit infrared light.
Human infrared thermometers have different emissivity from industrial infrared thermometers:
Human eardrum emissivity: 1
Human skin emissivity: 0.94
Industrial infrared thermometer emission rate: 0.95
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Non-contact temperature measurement application:
Stefan-Boltzmann law
Theoretical basis of temperature measurement by radiation thermometer.
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Application fields of human body infrared thermometer:
Health field: ear thermometer, ear thermometer, forehead thermometer, baby incubator
Security field: abnormal temperature screening (security gate, human temperature screening machine, etc.)
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Attentions in application of human body infrared thermometer:
1. The forehead infrared thermometer must emphasize that the subject is best off the forehead hair and aim the probe at the bare forehead. The distance from the forehead to the probe depends on the optical coefficient of the thermometer, preferably within half of the effective light path. It is best to install the probe directly above the channel, and the installation height and angle should be convenient for the forehead alignment.
Ear thermometers are often more accurate than forehead thermometers because the forehead temperature of the human body is affected by the ambient outdoor temperature, and the ear temperature is much more stable.
In contrast to the industrial infrared thermometer, the human infrared thermometer compensates for temperature. For example, the normal human body temperature should be kept below 37 ° C, and the measurement result of the forehead gun is about 36 ° C, because the infrared thermometer of the human body compensates the temperature, and the actual forehead surface temperature is about 33 ° C.
2. As far as possible, the person being measured should be in the measurement environment for a long enough time so that the surface heat transfer conditions of the person being measured are the same or similar. For example, at the airport, measurements should be taken 10 minutes after the passenger arrives at the airport terminal. At this time, the ventilation and temperature conditions of the terminal are basically stable, and the external heat transfer conditions of the passenger's forehead are basically similar.
3. The calibration device should be regularly compared with the calibration device in a timely manner. Some infrared thermometer products are affected by outdoor factors such as ambient temperature and climate.

Emissivity refers to the ability of an object to emit infrared light. Emissivity refers to the ability of an object to emit infrared light.
Human infrared thermometers have different emissivity from industrial infrared thermometers:
Human eardrum emissivity: 1
Human skin emissivity: 0.94
Industrial infrared thermometer emission rate: 0.95

Non-contact temperature measurement application:
Stefan-Boltzmann law
Theoretical basis of temperature measurement by radiation thermometer.
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