The temperature measurement accuracy of the thermal imaging temperature measurement gatekeeper is affected by many factors. So what factors affect the inaccurate temperature measurement of the thermal imaging temperature measurement gate machine?
1、 Reasons for the self equipment of the thermal imaging temperature measurement gate guard machine
1. Thermal imaging temperature measurement camera detector: Generally, metal packaging, ceramic packaging, crystal packaging, etc. are selected according to the packaging form of the detector. The power is not consistent at different ambient temperatures, and the temperature rise of the whole machine varies greatly, which makes it difficult for the temperature measurement compensation algorithm to provide accurate compensation, resulting in poor temperature measurement stability and consistency of the thermal imaging equipment.
2. The manufacturing process of thermal imaging temperature measurement cameras: Generally, each company has different methods, and the core still depends on the manufacturer's investment in production and manufacturing.
3. Temperature measurement compensation algorithm: The accuracy of temperature measurement compensation algorithm is very important, requiring a large amount of human body temperature measurement practical data accumulation, combined with big data analysis, to obtain temperature measurement compensation rules. Therefore, the more complex the data, the more accurate the compensation algorithm obtained.
2、 The reason for the thermal imaging temperature measurement gate machine to measure the temperature of human body parts
1. According to the measurement site, human body temperature can be divided into core body temperature and peripheral body temperature. Although the body temperature of each part can be used to express the body's heat situation, the temperature of the core part is preferred in scientific research. Commonly used measurement points include the pulmonary artery, the end of the esophagus, the nasopharynx, and the tympanic membrane.
2. The temperature measured through pulmonary artery catheterization is considered the gold standard for measuring core temperature, but temperature measurement here is not easy. In clinical practice, other parts close to the core temperature are used for temperature measurement, such as the mouth, armpits, forehead, etc., because these parts are comfortable, convenient, and sufficiently stable to measure. Generally speaking, anal temperature>Core temperature ≈ mouth temperature>Ear canal temperature>Axillary temperature>Erwen.
3. The influence of age on body temperature: On average, the body temperature of elderly people is slightly lower than that of adults. If the body temperature of elderly people is measured to be higher, the probability of fever is very high, and special vigilance is needed.
4. Physiological fluctuations in body temperature: Although humans are homeothermic animals, under normal circumstances, their body temperature changes subtly every day, with low sleep at night and high during the day.
3、 Other external influences on the temperature measurement error of the thermal imaging temperature measurement gate guard machine
1. The measurement error comes from multiple variables in the temperature measurement formula, including: overall target emissivity, ambient temperature of the reflecting surface, air temperature of the transmission coefficient, response value of the thermal imager, calibration precision, ambient temperature, relative humidity of the air, and precise measurement spacing.
2. Radiance of the tested object: Radiance is a physical quantity that describes the relative strength of the tested object to the blackbody radiation energy, and the emissivity of different objects varies.
3. Spatial resolution: refers to the field of view angle projected onto space by a single sensitive element after being transformed by an optical system. In practical applications, the distance coefficient of the thermometer is often overlooked, resulting in significant data errors.
