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Forehead Infrared Thermometer working principle

[2012-02-22]

Any object which temperature is above absolute temperature zero, then there is infrared radiation. Physics suggests, the human body is also a ir radiation sources, due to temperature sake constantly to around launch infrared radiation. Forehead infrared thermometer is receiving the infrared energy and design of small instrument, its core components is a kind of call infrared detectors photoelectric element, it can use their body infrared radiation into electrical signal, and then after electronics amplifier and processing into digital display temperature, its acquisition process of human body temperature information only 0.001 seconds or faster. When the body temperature slight changes, such as temperature, infrared thermometer 0.1 ℃ that can track and timely reflect, such high sensitivity is beyond what the other thermometer. Forehead infrared thermometer has the feature that non-contact measurement, accurate and fast, flexible and convenient use, etc .

In fact, using infrared thermometer measure temperature not only requires high precision instrument itself, but also involve human radiation properties and physiological characteristics and environmental impact. So, when the skin temperature of distance, watch deflection, wind or dust group raced, surrounding environment, such as heat source disturbance face exist sweat be soiled, dust or cosmetic, than radiation rates will change, inevitably bring temperature measurement data error.

In temperature measurement, we see testers will infrared thermometer to be testers yintang or ear cavities retrieving data, which is closely related with human physiological characteristics. Want to know, the human body although constant temperature, but present in each part of the body temperature is still differs. Usually, far from heart acromegaly endings temperature is a bit low, face and hands ℃ about 32. With bare outer facial as an example, the temperature of the nose begins and auricle than alar or of cricoid cartilage and base of tongue will degrees below, and easy influence by the environment. While YinTang, ear cavity temperature is constant temperature, is the ideal site. Therefore, there is infrared thermometer aimed at this two temperature measuring point. But, constant temperature only represent temperature intrinsic properties, environmental factors are still effecting temperature measurement results of important factor. Such as YinTang parts by environmental influence is bigger, a number of factors can cause detection error such as measuring indoor 'clock, carbon dioxide gas, sweat and acid and those tested place state, etc. In contrast, choose ear cavities as temperature measuring position best, because these interference factors basically can be avoided. Importantly, our core body temperature is mainly to the brain, heart and liver, temperature, eardrums with hypothalamic regulatory share common blood circulation. Say, measuring eardrums temperature of the human body only closer to the real temperature.