Method for calibrating tempering during thermal analysis of specimens
A thermal analysis and sample cavity technology, applied in the field of calibrating equipment for thermal analysis of samples, to achieve the effect of simple calibration
Active Publication Date: 2020-07-24
NETZSCH GERATEBAU GMBH
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Problems solved by technology
[0014] Disadvantages in the known calibration methods of this kind are for example the degree of complexity associated therewith and the limitation to a fully defined "calibration temperature" in which the melting takes place or another phase transition can be easily detected
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Embodiment Construction
[0054] figure 1 An apparatus 10 for thermal analysis of a sample is schematically shown.
[0055] The device 10 comprises a sample chamber 12 having a plurality (here four) of sample holders 14-1, 14-2, 14-3 and 14-4, the sample holders being correspondingly configured to hold a sample .
[0056] The arrangement of several sample holders advantageously enables the simultaneous conditioning and inspection of several samples, which in practice means a considerable saving of time. exist figure 1 exemplarily shows four samples P1, P2, P3 and P4, the four samples are each positioned on one of the sample holders 14-1 to 14-4 and thus for example in a unique "temperature program" The thermal analysis set by the device 10 may be subjected to during operation.
[0057] Here, a temperature program is understood to mean determining the temperature in the interior of the sample chamber 12 and the sample (in figure 1 Middle: Time-dependent trend of temperature from P1 to P4).
[0058...
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The invention relates to a method for calibrating a device (10) for thermal analysis of samples (P1 to P4). The method according to the invention comprises: carrying out a photothermal measurement on a determined sample or on a plurality of samples of the same kind by means of the photothermal measuring device (18, 20, 22) of the device (10), the determined For this purpose, the samples are held successively in several sample holders (14-1 to 14-4) of the device (10) and are respectively subjected to photothermal measurements, or a plurality of samples of the same type are held in several In each of the holders (14-1 to 14-4) and respectively carry out a photothermal measurement, wherein during the photothermal measurement, the first side of the relevant sample is irradiated with an electromagnetic excitation pulse, and the detection due to the excitation pulse And the thermal radiation emitted from the second side opposite to the first side of the sample; compare the results of photothermal measurements of a plurality of sample holders (14-1 to 14-4); based on the comparison results, for each The sample holders (14-1 to 14-4) respectively derive at least one correction parameter; and the temperature measuring device (26-1 to 26-4) and / or the device of the device (10) based on the obtained correction parameter (10) of the thermostat (16‑1 to 16‑4) for calibration.
Description
technical field [0001] The invention relates to a method for calibrating a device for thermal analysis of a sample. Background technique [0002] In thermal analysis, the properties of a material are examined as a function of temperature from a sample made of the material of interest. For this, correct thermometry, that is, correct measurement of the temperature of the sample, is important. [0003] Devices known from the prior art for thermal analysis of samples are, for example, temperature sensors in the form of thermocouples or resistance thermometers, which can be arranged, for example, in thermal contact with the sample in order to measure the temperature during the test. [0004] However, this measurement can be more or less erroneous, for example because such temperature sensors do not measure the temperature inside the sample but for example at the edge of the sample. This measurement error is even more insignificant for commonly used temperature sensors which do ...
Claims
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IPC IPC(8): G01N25/20
CPCG01N25/20G01N25/18
Inventor M·布鲁纳A·林德曼
Owner NETZSCH GERATEBAU GMBH