SU554576A1 - Method of measuring the quality factor of thermoelectric materials and devices - Google Patents

Description

instruments, i.e., those that can create (or measure) both constant and variable} as well. Also, it is possible to replace RGSPOLZION instead of the thirst of universal and universal devices, two specialized direct and alternating current devices with the corresponding switching system.

Before the test (by detecting the measurements of the sources 5, a random electromotive force is placed. Displaced: And U cm in / on the scale of the voltmeter 4, the value of U with voltage meter 4 through sample 1 is checked by the voltmeter 4 and detected value. Then, two ycTaiHioiBiO4iHbie b & 3 results of the operation were then produced. First, they let in from the first K and a 2 alternating: current through the sample L and adjust the current to such

value /, so that the voltage of the sample is measured and, as measured by a voltmeter, 4, with a short-circuited source 5, ..., the voltage is set to a previously determined value of em. iCMem, eHKiH i / cm- Then sample 1 is passed through source 1 from source 2; constant. is set to regulate it to the value of /, set by its alternating current /. When comparing av1Nvni (and in terms of static and (alternating voltages and currents) | Absolute (generally) values of nominal and 1 dei are generated, the (effective) values (of primary voltages and currents. The result of these two attitudes equal to the voltage and voltage across the aKTiHBHoiM resistance of the sample when a given (through a constant / value of the emf displacement, established earlier, is passed through it, which is co-current (the sample dissipation depends on the nature of the current,

IR f / oM.

After the second installation operation, the Source 5 IB from the 1MemoDal gland is inserted so that, E.D.S. the displacement was directed towards the univ the voltage on the sample and go to a single point, th (the state / state was cut to it, K was measured with a voltmeter 4, the value of the resultant n was measured (the voltage U, which turned out to be

, -f /, 2r-t / cM,

containing only linear then zT member:

Identified by the applicant, D0 | Broeness of the sample under test, from the record: from the recording of the results of the measured values i / oi and U taking into account the measurement of the temperature T, is carried out by calculation

  -L,

- / cmT

If, when measured by the described op / OSoba, E.D.S. Obsmeleniya: choose within the range of the measuring voltage tester-not-1 arbitrary, and some constant for all measurements of the magnitude, a trimer C / cm const,

; pr we The value of rT is determined on the basis of a voltage meter calibrated in advance by the law zT Wconst. If. When measured by the described method of e. displacements choose, within the scale of the meter, of a meter not of an arbitrary value, but determined by the law t / cm s / G, where C is constant for all short-term measures (Coefficient, then the computational operation 10 by definition of quality factor will marry any results measurements to the division of the magnitude of the resulting voltage by the same magnitude C and can be aiMenena.direct measurement of dubroticity: z io w.kale voltage meter, calibrated in advance by the law g C // C.

If. When measured according to the procedure described above; e. the displacement to choose, in the scale limits, of the meter, the voltage is not equal to one magnitude, a. Since the law U (. ,,, is YUR / T, where p is an integer or zero, is constant for all measurements, then the computational parameter, by definition, of the quality factor, is assigned to any measurement result. X

5 by a decrease in order of magnitude (IB decimal. Calculus system). The magnitude of the resulting voltage f /, measured on the scale of the meter for the voltage without its preliminary calibration.

0 The proposed method for measuring the quality factor of thermoelectric materials and devices allows several times (not less than half) to speed up the process of determining the quality factor of the quality factor due to

5 refusal. And from intermediate operations of measurements, for: recording of the results of measurements and subsequent calculations, so as to measure, the parameters of the consecutive samples are read directly. On a scale of measuring free space.

0 Especially effective is the use of the proposed method in the areas of frills of thermoelectric devices at flow (control and r.azb.r.: а.ko (thermoelements and: modules).

Claims (3)

1. Barman T. S. .. J Appl Phys 1958 № 29, No. 10 p. 1373, 374. 2. M.ar; Iman M.A., Marycheva G.P., Simanovky l. M. Factory Lab, 1970, -t. ..36, jYo 12, (p. 1523. 3. The report of the All-Inclusive “About-iedovodokogo” and “Institute of Refrigeration and Industry, resh. No. 71045E9b, M., 1970, p. 20-21. ../ 8 ... g Ui.