SU480921A1 - Spectrometer Pyrometer - Google Patents

Description

one

The invention relates to the field of radiation pyrometry and can be applied, for example, in the control of technological processes in the ferrous metallurgy.

A spectral ratio pyrometer operating at three wavelengths, containing an optical system, light filters for highlighting narrow spectral regions, thermal receivers, pre-amplifiers and allowing to determine two color temperatures, which are used to calculate true temperature using nomograms. In this case, the dependence of the radiation coefficient on the wavelength is assumed to be known.

A disadvantage of the known device is the need to use new nomograms to calculate the true temperature when changing the material of the test sample.

To change the gain factors depending on the radiating properties of the material whose temperature is measured, the proposed pyrometer is equipped with a regulating device connected to the preamplifiers.

The drawing shows a block diagram of the described pyrometer comprising a common optical system 1, individual light filter 2, thermal receiver 3 and preamplifier 4 for each spectral range, block 5 for calculating the color temperature for each of two powerful spectral sections, the inputs of which are connected to the corresponding thermal receivers through preamplifiers 4, and the outputs are connected to the input of the secondary device 6, and a device 7 for changing the gain factors of preamplifiers 4 depending on the radiation properties of the material whose temperature is measured.

The pyrometer works as follows. With the help of the optical system 1, the radiation energy of the heated body is focused through

light filters 2 to thermal receivers 3. The voltage arising in thermal receivers 3 is applied to preamplifiers 4, the output voltages of which are fed to blocks 5. From one of blocks 5, the signal is transmitted to

secondary device 6.

In the transition to measuring the temperature of the sample, the monochromatic emissivity of which differs from the monochromatic emissivity of the sample, the temperature of which was controlled immediately before this, the newly measured color temperatures will differ significantly from each other and from the true temperature, since the amplification factors of the preamplifiers are 4: : ykn1Shi. To make it possible to measure the true temperature of the new sample, it is necessary to change the gains of preamplifiers 4 with the help of device 7 so that the output signals of blocks 5 are equal. The necessary gains of preamplifiers 4 can be achieved by changing the leakage resistance, which is provided by turning the switch key. In this case, the resistance value is selected during the preliminary calibration of the pyrometer while controlling the true temperature of the sample, for example, by a thermocouple.

Subject invention

A spectral ration pyrometer containing a common optical system, individual light filters, thermal receivers and amplifiers for each spectral region, a color temperature calculator for each two spectral sections, whose inputs are connected to thermal receivers via amplifiers and a secondary device that differs in amplification factors depending on the radiating properties of the material whose temperature is measured, the pyrometer is equipped with a regulating device connected according to o to each amplifier.