Method for heating and temperature determination of specimens

FIELD: measurement equipment.

SUBSTANCE: invention relates to measurement equipment and can be used for heating and temperature measurement of specimens, which are transparent in an infrared (IR) radiation region. The invention proposes a method for determination of temperature of specimens, which are transparent in an IR region, subject to action with flows of charged particles or electromagnetic radiation, which involves heating or cooling of specimens, measurement of temperature of specimens by means of thermocouples. Specimens are placed in a closed housing made from material with high thermal conductivity and located in a vacuum chamber; air is pumped out till the pressure is 10-3-10-5 Pa; the housing is heated or cooled at the specified temperature interval. Continuous preliminary temperature measurements are performed with thermocouples located outside and inside the housing together with the test specimens till temperature stabilisation moment. Then, final temperature measurements are performed with these thermocouples at a stabilisation moment of the temperature that coincides with the temperature of the test specimen till external action with flows of charged particles or electromagnetic radiation. External action is performed; after external action is completed, a specimen temperature measurement procedure is repeated.

EFFECT: improving accuracy of determination of temperature of specimens transparent in an IR region.

1 dwg

 

The invention relates to measuring technique and can be used to measure the temperature of the samples, transparent in the infrared (IR) radiation area.

There is a method of determining the temperature of the samples is transparent in the infrared region, the affected streams of charged particles or electromagnetic radiation, comprising heating or cooling the samples, the temperature measurement samples using thermocouples, the sample is placed in a closed housing made of a material with high thermal conductivity, situated in a vacuum chamber, pump out the air to a pressure of 10-3-10-5PA, heat or cool the body at a given temperature interval (see patent RU 2212650, 20.09.2003).

The disadvantage of this method of temperature measurement is the dependence of the temperature of the measuring junction of thermocouple is not only on the surface temperature of the sample to be measured, but also on the intensity and spatial patterns of infrared radiation, which makes the process of determining the temperature of the sample is uncertain.

The objective of the invention is to develop a method for determining the temperature of the samples is transparent in the infrared region, excluding the effect of spatial inhomogeneity of infrared radiation, different inertia absorption of infrared radiation, thermocouples with low inertia and a large absorption coefficient and the subjugated samples with significant inertia and a low absorption coefficient.

This technical result is achieved by a method for determining the temperature of the samples is transparent in the infrared region, the affected streams of charged particles or electromagnetic radiation, comprising heating or cooling the samples, the measurement of the sample temperature using thermocouples, the sample is placed in a closed housing made of a material with high thermal conductivity (low thermal inertia, resistant to ionizing radiation - copper, steel), located in a vacuum chamber, pump out the air to a pressure of 10-3-10-5PA (corresponds to a high vacuum (beeaif.com/node/88 when the length of the free path of air molecules of the vacuum chamber by several orders of magnitude, which excludes the impact of air molecules on the heterogeneity and instability of the temperature inside the cell temperature during the temperature stabilization of the sample 5 min/deg), heat or cool the body at a given temperature interval, produce a continuous preliminary temperature measurements by thermocouples located inside and outside of the body together with the test samples, until temperature stabilization, and then produce the final temperature measurement data of thermocouples at the time of temperature stabilization, which coincides with temperaturesensitive sample to external influence flows of charged particles or electromagnetic radiation, produce external effects, after external exposure to completely repeat the procedure for measuring the temperature of the samples. At the same time, the whole area changes and temperature measurement after changing the excitation of the investigated samples determines the temperature sets the temperature interval and controls the time of occurrence of thermal equilibrium automatic high-precision temperature controller (art) (www.ngpedia.ru/id224605p2.html).

For initial studies of the temperature field inside and outside temperature cells (closed body) number of thermocouples inside and outside can be quite large, once calibrated, this specific cell temperature thermocouples installed at places minimal fluctuations of the temperature field gradient, and their number is reduced to the necessary minimum in the limit to one inside the case (if known relaxation time of the temperature field). Smooth warming (cooling) of the case warrants inside temperature gradients measured by thermocouples, long-term temperature regime provides heating (cooling) of the samples inside it, to the temperature of the body.

The drawing shows the design temperature of the cell, allowing to carry out this method.

The cell is in a vacuum Cham is e 1 and consists of a detachable housing 2, the base 3, the heater casing 4, the cooler body 5, the electromagnetic plunger 6, the samples 7, liners for shielding exposure to 8, the holes for external exposure to 9, the plate that covers the external opening and shielding from heat loss and external radiation 10, thermocouples 11, high-precision automatic temperature controller (art) 12, external exposure to 13, a heat shield 14, the free volume of the cell for receiving the samples and inserts 15, the vacuum pump 16.

The method of determining the temperature of the samples is carried out as follows. Pre-vacuum pump 16 is pumped out the air to a pressure of 10-3-10-5PA, measured the initial temperature of the sample through the measurement of temperature inside and outside the housing 2 in series thermocouples 11 until then, until a certain temperature thermal equilibrium, which coincides with the initial sample temperature to external influences, then after opening the plate that covers the external influence 10 through the opening to outside influences 9 the first lower pattern 7 is subjected to external impact, for example, irradiation with a laser, then closes the plate 10 and again measured the sample temperature through successive temperature measurements outside and inside termopane 11 until until a certain temperature thermal equilibrium, which coincides with the temperature of the sample after exposure. To study differences in the change in the degree of exposure and the temperature change in the cell provides a mechanism for changing samples. Using electromagnetic plunger 6, the first lower pattern 7 and the liner 8 are shifted from the field of external action in the free volume of the cell for receiving the samples and inserts 15. Then turns on the heater 4 or cooler 5 with the aim of raising or lowering the temperature at a given interval and repeats the procedure for measuring the initial temperature of the sample to external influences through the measurement of temperature inside and outside of the housing 2 thermocouples 11 until then, until a certain temperature thermal equilibrium, which coincides with the initial temperature of the second sample 7 to external influences, and then, on the second, the sample 7 is affected, for example, a laser beam of the same power density and again measured the temperature of the second sample 7 serial temperature measurement inside and outside of the housing 2 thermocouples 11 up until will not install certain temperature thermal equilibrium, which coincides with the temperature of the second sample 7 after the second external impacts is Viy at different initial temperatures. At the same time, the whole area changes and temperature measurement, as well as changes impact on the analyzed samples determines the temperature sets the temperature interval controls the time of occurrence of thermal equilibrium and sends signals to actuators (EU) heater, cooler automatic high-precision temperature controller (art) 12.

Example

The body temperature of the cell was performed with dimensions 15×15×60 mm of copper. To create a vacuum using a standard vacuum unit UVR-32, measurement and control of temperature was carried out high-precision temperature controller art-2 with a measurement error of 0.01°C. the Time mode from 20°C to 500°C with a fully loaded cell and the achieved vacuum 10-3-10-5PA was 15 minutes. The size of the sample made by the method of puncturing of a single crystal of KCl was 10×10×2 mm, while the inertia of a fully loaded cells in these samples was 5 min/deg in the temperature range from 200°C to 500°C. the relative error in the temperature measurements was 3%. When using NaCl crystals lag was 5 min/deg in the temperature range from 200°C to 500°C at the same relative error of measurement.

Thus, this way of using close spaced sublimation technique volume and thermal field is heterogeneity is less measurement error in the temperature cell enables to determine the temperature of any of the samples, including transparent in the infrared region with high accuracy, because it eliminates the preferential heating of thermocouple due to the infrared radiation without heating the samples are transparent to infrared radiation.

The method of determining the temperature of the samples is transparent in the infrared region, the affected streams of charged particles or electromagnetic radiation, comprising heating or cooling the samples, the temperature measurement samples using thermocouples, the sample is placed in a closed housing made of a material with high thermal conductivity, situated in a vacuum chamber, pump out the air to a pressure of 10-3-10-5PA, heat or cool the body at a given temperature interval, characterized in that produce continuous preliminary temperature measurements by thermocouples located inside and outside of the body together with the test samples, until temperature stabilization, and then produce the final temperature measurement data of thermocouples at the time of temperature stabilization, which coincides with the temperature of the sample to external influence flows of charged particles or electromagnetic radiation, produce external effects, after external exposure to completely repeat the procedure for measuring the temperature of the samples.



 

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