SU531046A2 - Pressure meter - Google Patents

Description

(54) HSjMEPMTEnb PRESSURES

one

This invention relates to instrument engineering.

Known pressure meter, No. 492768, containing an elastic sensing element, a metal rod, a transducer moving the sensitive element into an electrical signal, made in the form of a high-frequency cable with current collectors and a blind hole, and an indicator

However, in a known pressure gauge, the readings of the meter depend not only on the depth of the rod in the transducer (useful signal), but also on the change in high-frequency power supplied to the transducer (parasitic signal), i.e. from changes in the power of the high-frequency generator under the influence of various factors (temperature, power voltage, time, etc.). With these changes, an error signal appears, recorded as a change in pressure.

The aim of the invention is to improve the accuracy.

For this purpose, in a pressure gauge manufactured by aut. St. N9 492768, in high-frequency: a second blind hole was inserted into which a stationary column was inserted;

Amgiitiuds of stresses induced on a mobile and fixed metal rods 1 -: can be presented as

,

 where where A and B are the coefficients of proportionality;

DB is the amplitude of the electric field intensity,

 and P. Dentist - immersion depth of the moving and stationary rods, respectively.

The relationship meter registers the value

and.

Oa

u.

. Se-

 const),

not full

Claims (2)

the propordial pitch depth of the mobile rod and the field Ej, which does not depend on the strength, and hence on the generator power. The drawing is a schematic of the construction of a pressure gauge. The pressure gauge contains a high-frequency cable section 1, into which a movable rod is embedded 2. The rod 2 through the dielectric gasket 3 is fixed rigidly to the sensing element 4, the fixed rod 5 is isolated from the pressure gauge housing. The meter operates as follows. When a pressure is applied to the sensing element 4, it drives the rod 2, resulting in a change in the degree of coupling between the rod 2 and the length of cable 1. Voltage; movable 2 and fixed 5 rods are applied to a voltage ratio meter 6. The output voltage of the relationship meter-6 is directly proportional only to the depth of the movable rod 2, and hence to pressure. The readings of the meter do not depend on the change in the high-frequency power supplied to the converter, as a result of which the accuracy of pressure measurement is increased. Claims of pressure gauge according to ed. No. 492768, characterized in that, in order to improve accuracy, there is a second blind hole in the high-frequency cable, into which a fixed metal rod is inserted connected to the second input of the electrical signal indicator. The source of information taken into account in the examination, 1. Copyright certificate USSR N9492768, 01 L 11/00, 02/18/74 (prototype).