SU1086365A1 - Device for measuring losses of material weight in vacuum - Google Patents

Abstract

A DEVICE FOR MEASURING LOSSES OF WEIGHT MATERIALS IN A VACUUM containing a heater placed in a vacuum chamber with a test material and a meter located opposite it, characterized in that in order to improve the determination accuracy at elevated temperatures, the meter is designed as a specific thermal sensor. current

Description

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The invention relates to chemistry and is intended for investigations into the physical properties of materials, namely, for researching materials for resistance under vacuum conditions at high temperatures.

A specific heat flux sensor is known, consisting of a central battery, a peripheral battery, made in the form of sectors, a third battery, and a housing. The central and peripheral batteries are connected to the fl 3 measuring devices.

The known sensor is designed to measure the temperature of the condensation material on it.

A device for measuring the weight loss of materials in vacuum is known, which contains a heater G2 3 placed in a vacuum chamber with a test material and located opposite it,

However, in the known device, the accuracy of measuring the weight loss of a material is impaired due to the heating of the sensitive element during the test.

The purpose of the invention is to increase the accuracy of determination at beer temperatures,

The goal is achieved by the fact that in the device containing a heater placed in a vacuum chamber with the material under test and dispersed in front of it a meter, the meter is made in the form of a specific heat flux sensor.

FIG. 1 schematically shows the proposed device, a general view of / in FIG. 2 shows the specific heat flow sensor in FIG. 3 is a circuit for turning on a specific heat flow sensor,

The device consists of a vacuum cage of Measure 1, in which test chamber 3 with heater 4 is placed on mounting table 2 with heater 4 opposite the specific heat flux sensor 5 located in thermostat 6, through which refrigerant (liquid nitrogen) is passed.

The specific heat flux sensor consists of the central battery 7, the peripheral battery 8, which is made intermittently in the form of different sectors, the third battery 9 and the hull H, each has its own radius,)

The central and peripheral batteries 7 and 8 are connected to measuring devices 11 and 12,

The device also contains pins 13-16.

& 11VODA 13 are used to remove the total electric signal from the peripheral 8 battery, output 15 - to remove the electric signal from the sig- nal from the sectors of the peripheral battery, 16 outputs - to remove the electric signal from the other sectors of the peripheral battery.

For measurements of the relative losses of material in vacuum in the chamber 1 of the beginning create a residual pressure of 0 Torr. The sample under study 3 on mounting 2 is diluted with heater 4 to a predetermined temperature. The material from which the sample under study is selected under the influence of temperature evaporates and enters and the sensor 5 of the specific heat flux condenses on it.

The temperature difference caused, on the one hand, by the heater 4, and on the other hand, by the thermostat 6, through which the refrigerant (liquid nitrogen) is passed, enhances the condensation effect of the evaporating specimens of the sample material.

The implementation of the meter in the form of a specific heat flux sensor for measuring the relative weight loss of the material in vacuum was made possible due to the dependence of the voltage value of the signal from the sensor on the value of the mass to be condensed; and KxM, where U is the voltage of the signal taken from the sensor, the value measured by a voltmeter, mV; K is the coefficient of mass sensitivity of the sensor, mV / g, the value obtained from the calibration of the sensor; M - kotchesgvo condensable mass of the material on the sensor, g, the desired value.

With a voltmeter, the voltage value of the specific heat flux sensor signal, which is directly proportional to the heat flux nocjynaeMoro and the condensed mass, and replacing the known values with the UKxM dependence, yields the desired value M.

The specific heat flux sensor is calibrated.

The implementation of the meter in the form of a specific heat flux sensor can significantly improve the accuracy

Claims (1)

DEVICE FOR MEASURING LOSS OF WEIGHT OF MATERIALS IN VACUUM, containing a heater placed in a vacuum chamber with the material being studied and a meter located opposite it, characterized in that, with a circuit for increasing the accuracy of determination at elevated temperatures, the meter is made in the form of a specific heat flux sensor. Pumping I 10866365 ²