Measurement principle and characteristics of colorimetric thermometer

Abstract: The information on the measurement principle and characteristics of colorimetric thermometers is provided by excellent flowmeter and flowmeter manufacturers. The colorimetric pyrometer has high sensitivity and fast response, can observe small targets, and has high halo measurement accuracy. The temperature measured by the colorimetric pyrometer is closer to the real temperature than the optical pyrometer and the total radiation pyrometer. It can be used to measure the temperature of molten iron, molten steel and slag. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following are the details of the measurement principle and characteristics of the colorimetric thermometer. The colorimetric pyrometer has high sensitivity and fast response, can observe small targets, and has high halo measurement accuracy. The temperature measured by the colorimetric pyrometer is closer to the real temperature than the optical pyrometer and the total radiation pyrometer. It can be used to measure the temperature of molten iron, molten steel and slag. The direction of increase or decrease changes, so that the brightness ratio at wavelength Ai and human 2 changes, and by measuring the change in brightness ratio, the corresponding temperature of different objects with the same temperature can be measured at wavelengths A! and; 12. The brightness is different, so the colorimetric pyrometer also uses a black body scale. Now the concept of colorimetric temperature is introduced. When the brightness ratio of an actual object with temperature r at two wavelengths a and 2 is equal to the brightness ratio of a black body with temperature Ts at the above two wavelengths, then rs is called the colorimetric temperature of the object | Press this It is stipulated that the relationship between 71 and: Ts is in the formula, where ? is the wavelength and the monochromatic emissivity under a2, respectively; c2 is Planck's _ constant. What the colorimetric pyrometer indicates is the colorimetric temperature of the object, and the true temperature is required to be corrected by formula (2-29). Less than, equal to, or greater than the true temperature. _eAi=~2, that is, when the measured object is a gray body, the colorimetric temperature is equal to the true temperature of the measured object, which is the biggest advantage of the colorimetric pyrometer. At this time, the indication value of the instrument is the colorimetric temperature, which can be considered to be approximately equal to the real temperature of the measured object without correction. 2) Although the e value and ~ value of the actual object vary greatly, the ratio of ^^ and ^^ of the same object varies less. Therefore, the difference between the colorimetric temperature and the real temperature is much smaller than the brightness temperature, the radiation temperature and the real temperature, and the measurement accuracy is high. All color radiation energy is absorbed. Although the absorption sample, it has little effect on the ratio of monochromatic radiation power (brightness ratio). Therefore, the colorimetric pyrometer can be used in harsh environments. 2. The structure of the colorimetric pyrometer Colorimetric pyrometer According to its structure, it can be divided into two types: single-channel type and dual-channel type.丨The following is wds—An example of an n-type colorimetric pyrometer, which introduces the structure and principle of a dual-channel colorimetric pyrometer. It uses two optoelectronic devices (silicon photovoltaic cells) to receive monochromatic radiation of two different wavelengths respectively. Its optical path system is shown in Figure 2_61. The radiant energy of the measured object is focused on the through-hole mirror 5 through the objective lens 4, and the 6 to form parallel light and project it onto the beam splitter 7. Beamsplitters partially transmit long wavelengths (infrared) and partially reflect short wavelengths (or visible light). The long-wave part and the short-wave part are absorbed by silicon photocells 8 and 9 with infrared filters and visible filters, respectively, and are converted into electrical signals and sent to the corona detection circuit. The edge of the through-hole reflector is coated and polished, except for the opening, other parts can reflect the human light to the reflector 1, and then pass through the inverted mirror 2 and eyepiece 3 for the human eye cat. The dual-channel colorimetric pyrometer has a simple structure. It is easy to use, but the characteristics of the two silicon photocells must be maintained without time-varying. Radiation temperature measurement plays an important role in: i-range temperature measurement. However, as mentioned above, most radiation thermometers cannot Measured real temperature I If the real temperature is to be obtained, it must be corrected by the measured surface emissivity. However, the emissivity is difficult to measure accurately, which makes correction very difficult. When using the pre-reflector radiation thermometer to measure the temperature, the influence of the emissivity can be basically eliminated as long as the emissivity of the measured surface is greater than 0.6 (no need for know the exact value) can directly measure the true temperature’without any correction. The structure of the pre-reflector radiation thermometer is shown in Figure 2-62. The surface of the measured object 6 and the hemispherical reflector 5 form a closed cavity. The lens 4 focuses the light on the thermopile 1 from the small hole 2 at the top of the reflector. In this way, the radiation received by the thermopile is very close to the blackbody radiation of the measured object at the same temperature, and the indication value of the blackbody scale meter is the true temperature of the measured object. Therefore, the inner surface must be kept clean frequently.

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