The best way to pick an infracrven termometar
Performance indicators, such as temperature range, spot size, working wavelength, measurement accuracy, response time, etc.; environmental and working conditions, such as ambient temperatura, window, display and output, protection accessories, etc.; other options, such as ease of use, maintenance And calibration performance and price, etc., also have a certain impact on the choice of termometar. With the continuous development of technology and technology, the best design and new progress of infracrven termometri provide users with various functional and multi-purpose instruments, expanding the choice.
Određivanje temperatura raspon
The temperature measurement range is the most important performance index of the thermometer. Such as TIME (time), Raytek (Raytek) products cover the range of -50} degree 3000 Degree , But This Cannot Be Done by Type of infracrven termometar. Each type of termometer has its own specific temperature range. Stoga, the user's measured temperature range must be considered točno i sveobuhvatno, Neither too narrow nor too wide. Accord to the the law of blackbody radiation, the change of radiation energy caused by temperature in the short-wave band of the spectrum will exceed the change of radiation energy caused by emissivity error. Therefore, it is better to use short-wave as much as possible when mjer temperatura.
Odredi cilj veličina
Infracrven termometri can be podijeljeno into jednobojni termometri i dvobojni termometri (radiacija kolorimetrijski termometri) accord to the principle. For monokromatski termometri, when measure temperatura, the area of target to be measured should fill the field of view of the termometar. It is recommended that the measured target size exceed 50 percent of the field of view of view. If the target size is smaller than the field of view, the background radiation energy will enter the visual and acoustic symbols of the thermometer and interfere with the temperature measurement readings, causing errors. Conversely, if the target is larger than the pyrometer's field of view, the pyrometer will not be affected by background outside the measurement area.
For a dvobojni termometar, the temperatura is određen by the ratio of radiant energy in two independent wavelength bands. Therefore, when the target to be measured is small, does not fill the site, and there is smoke, dust, or opstrukcija on the measurement path that attenuate the radiation energy, it will not affect the measurement results. Even the case of 95 percent energy atnution, the Required temperatura mjerenje točnost can još uvijek be zajamčeno. For ciljevi to are Small And Moving Or vibriranje; Sometimes Move within The Field of View, Or May Partially Move Out The The Field of View, Under These Conditions, The Use of A Two-Color Thermometer Is The The Choice. If it is impossible to aim direkt between the termmetar and the the target, and the measurement channel is bent, narrow, blocked, itd., the two-color fiber optički termometar is the best choice. This is due to its small promjer, flexibility, and ability to transmit optički radiant energy over curved, blokirano, Enabling Measurement of Targets That Are Difficult Access, In Harsh Conditions, Or Near Electromagnetic Fields.
Determining Optical Resolution (Distance and Sensitivity)
The optical resolution is od by the ratio of D to S, which is the ratio of the distance D between the the pyrometer to the target and the promjer S of the measure spot. If the termometer must be installed far away from the target due to environmental conditions, i a small target must be measured, a termometar with high optical resolution should be selected. The higher the optical resolution, that is, the D:S ratio, the the cost of the termometar.
The emissivity and surface properties of the target material determine the spectral response or wavelength of the pyrometer. For high reflectivity alloy materials, there is low or varying emissivity. In the high temperature area, the best wavelength for measuring metal materials is near infrared, and the wavelength of {{0}}.18-1.{{20}}μm can be selected. Other temperature zones can choose 1.6μm, 2.2μm and 3.9μm wavelength. Since some materials are transparent at a certain wavelength, infrared energy will penetrate these materials, and a special wavelength should be selected for this material. For example, the wavelengths of 10 μm, 2.2 μm and 3.9 μm are used to measure the internal temperature of the glass (the glass to be tested must be very thick, otherwise it will pass through) wavelengths; The wavelength of 3.43 μm is used for measuring polyethylene plastic film, and the wavelength of 4.3 μm or 7.9 μm is used for polyester. If the thickness is more than 0.4mm, choose the wavelength of 8-14μm; another example is to measure the C02 in the flame with a narrow-band 4.24-4.3μm wavelength, measure the C0 in the flame with a narrow-band 4.64μm wavelength, and measure the N02 in the flame with a 4.47μm wavelength.
Signal obrada funkcija
The response time indicates the reaction speed of the infrared thermometer to the measured temperature change, which is defined as the time required to reach 95 percent of the energy of the final reading, which is related to the time constant of the photodetector, signal processing circuit and display system. The response time of the new infrared thermometer can reach 1ms. This is much faster than the contact temperature measurement method. If the moving speed of the target is very fast or when measuring a fast-heating target, a fast-response infrared thermometer should be selected, otherwise the sufficient signal response will not be achieved and the measurement accuracy will be reduced. However, not all applications require a fast-response infrared thermometer. For stationary or target thermal processes where thermal inertia exists, the response time of the pyrometer can be relaxed. Therefore, the choice of the response time of the infrared thermometer should be adapted to the situation of the measured target.
environmental considerations
The environmental conditions of the thermometer have a great influence on the measurement results, which should be considered and properly resolved, otherwise it will affect the temperature measurement accuracy and even cause damage to the thermometer. When the ambient temperature is too high and there is prašina, smoke and steam, the protective cover, water cooling, air cooling system, air air lighting system, air blower and other accessories Provided BY the manufacturer can be selected. These accessories can effective solve the environmental impact and protect the thermometer to achieve accurate tempera measurement. When determining accessories, standardized services should be requested as much as possible to reduce installation costs. To investigate smoke, dust, or other particle that reduce the measured energy signature, a two-color thermometer is the the best choice. Under noise, electromagnetic field, vibration or inaccessible environmental conditions, or other harsh conditions, the fiber optičko dvobojno termometar is the best choice.
