SU752163A1 - Material moisture-content determining method - Google Patents

Description

heat and heat between measuring points, which uniquely depend on the moisture content of the material.

The measurement can be performed immediately after the occurrence of the temperature difference at the measurement points, which allows to increase the measurement speed to values comparable to the time of the heat pulse.

FIG. 1 depicts the scheme of arrangement that implements the proposed method; in fig. 2 - graphs of measurement of temperature at the measuring points and the heat of the material's zoli surface.

The device contains heat source I, material under study 2, first measurement point 3, second measurement point 4, heat insulator 5.

FIG. 2 shows the curve 6 measurement; rh: and the temperature at the first measurement point, curve 7 measuring the temperature at the second measurement point, the temperature difference 8 between the measurement points at the moment of intention 9.

The measurement according to the proposed method is carried out as follows.

A heat source i is released onto the surface of the material under study 2, releasing the caliphened heat into the material. howl impulse. Between points 5 and 4 on the surface of material 2, isolated together with the heat source by means of ter (thermal insulator 5 from the environment), the temperature difference is determined. Since at point 3 the temperature varies over time along curve 6, and at point 4 - according to curve 7, then at the moment of measurement 9 when heat passes (sun; 0 I) M: pulse between points 1 and 4 and 5, a temperature difference 8 is obtained depending only on the magnitude of the moisture content of the material under investigation.

 and are not decisive and are chosen so that when the heat pulse is applied (from the source 2, the heat wave energy is sufficient to heat the heat receivers (for example, ter / mopar) to a value that will measure the temperature difference at points 3 and 4, but must be fixed in order to obtain an unambiguous calibration.

Using the proposed method will allow to increase the accuracy and speed of moisture measurement. The latter allows the use of the proposed method for measuring the moisture content of wood in

the drying process, which will increase the quality of products, since the quantity of marriage will decrease and the speed will increase.

Forsmula of IUBRETEN

The method of determining the moisture of a material by introducing a heat pulse and a temperature at a point at a given

distance from the heat source on the thermally insulated surface, characterized in that, in order to improve accuracy and reduce the determination time, at the same time, the point is measured,

located between the source, the heating point and the first measurement point, at a given distance from the last, and the humidity value is judged by the difference in readings.

Source of} and information

taken into account in the examination:

1. The author's Holy Child

USSR number 389452, cl. G 01 iN 125Jb, 1971.

2. USSR author's certificate number 38Yu09, cl. G 01 N 25/00, 1971 (prototype).

Claims (1)

Claim The method of determining the moisture of the material by introducing a heat pulse and measuring the temperature at a point at a given distance from the heating source on the thermally insulated surface, characterized in that, in order to improve accuracy and reduce the determination time, they simultaneously measure at the point located between the heating source and the first point measurement, at a given distance from the latter, and the amount of humidity is judged by the difference of testimony.