What is the principle of the door infrared thermometer?
Door-type pyrometer consists of infrared optical lens, filters, sensors and electrical signal processing unit, etc. It is capable of detecting infrared radiation from the target to be measured;
And according to the intensity of its radiation to determine the temperature of the target, can be conveniently installed in a variety of applications, especially suitable for the need for long distance, stronger interference in the installation of industrial environments.
Door-type infrared thermometer with cast aluminum shell, temperature measurement site with good protection.
This instrument measures the surface temperature of the human forehead, and then the actual body temperature is obtained according to the relationship between the temperature of the human forehead and the body temperature.
The optical component of the detector collects the energy emitted and reflected from the forehead onto a sensor, and the electronic component converts this information into a temperature reading which is displayed on the display panel;
When the temperature reading exceeds the high-temperature jing value, the instrument will emit a jing sound, and at the same time, the red jing light is lit, such as the body temperature is normal green jing light is lit.
Working principle:
(1) the natural world, all temperatures higher than zero-degree objects, due to the thermal movement of molecules;
Are constantly radiating to the surrounding space, including infrared waves, including electromagnetic waves, the radiation energy density and the object itself is proportional to the temperature of the fourth power.
Small changes in temperature will cause significant changes in radiant energy, so the use of infrared radiation to measure the temperature of the object is very sensitive.
(2) The infrared radiation characteristics of the human body and its surface temperature has a very close relationship, the human body mainly radiates infrared wavelengths in the 9 ~ 10 μm;
By measuring the infrared energy radiated by the human body itself, the surface temperature of the human body can be accurately determined.
As the wavelength range of light is not absorbed by the air, and thus can be utilized to measure the human body surface temperature of the infrared energy radiated by the human body.
(3) The advantage of infrared temperature measurement technology is non-contact, rapid measurement, within 1 second can be tested.
Because the infrared thermometer only receives the infrared radiation energy emitted by the human body, without any other physical and chemical factors acting on the human body, so there is no harm to the human body.
Infrared thermometer use characteristics:
Non-contact measurement, no contact with the human body, to avoid cross-infection, no need for health **.
Fast detection speed, generally shorter than 0.5 seconds.
Body surface temperature automatic conversion, the forehead surface temperature measurement results converted to the human body armpit temperature is displayed.
Body temperature exceeds 38 ° monitor automatically report jing, the detector's red light will flash, while beeping to remind the inspector.
Alarm temperature is self-setting, such as 37.8°C.
The ambient temperature is automatically compensated, eliminating measurement errors caused by ambient temperature changes.
Output cables can be twisted pair or multi-component stranded wires with shielding layer. Conductor cross-section requirements (copper):
When up to 250m long: 0.2mm2 cross section
When up to 650m long: 0.5mm2 cross section
