SU577417A1 - Method and apparatus for dynamic calibration of pressure sensors - Google Patents

Description

I

This invention relates to instrumentation, in particular, to methods and devices for dynamically calibrating pressure sensors.

The most widespread in the field of low impact pressure of the popupip t is 5 sensors on shock tubes D-}

In this case, the pressure acting on the sensing element of the sensor is calculated according to the Theoretical Formulas, we need a large sliding pad, 10

The closest to the proposed method is the dynamic calibration of the pressure sensor using a device consisting of a capacitor battery (capacitive storage), the discharge of the scale, the inductor and a 1.5 electrically conductive disk C2J. The pressure sensor is calibrated in following sequence. The pressure of the magnetic pop created when a capacitor battery is discharged onto an inductor, 20 is applied to the surface of a disk of electrically conductive material, passes through it, acts on the sensitive sensor element and causes an electrical signal recorded on the oscilloscope (}). Then 5

The amount of energy stored in the capacitor bank is determined by the pressure, which is matched to the voltage of the gage sensor.

However, the method is characterized by low calibration accuracy.

The circuit of the invention is to increase the accuracy of the calibration.

This circuit is achieved by the fact that the magnetic field created by the discharge of the capacitor battery inductor through the transmitting medium is transmitted to the sensitive sneMeinv sensor and causes an electrical signal, but is canceled, then by the value of inductive mag11: TH (the second floor, measured in those (those of the calibration process, are found on the record in accordance with the voltage of the rapifpyeNioro patches).

The device, realizing; this modality, contains capacitance No. 1.y storage device, gage, and) 1P switch and electrically conducting rammer P1 element, transmitting pressure on the calibrated dat1t, performed on the vice node of the shell, with the morning and the upper side

which are located sensors induction magnetic field. ;

The drawing shows schematically a device that implements the proposed method,

The device contains a discharger 1, a capacitive voltage detector 2, an inductor 3, a shell 4 of a well-conducting material, induction pressure sensors 5 and a test sensor 6, a dielectric body 7.

The pressure sensor is calibrated as follows.

When a control pulse is applied to the firing electrode of the discharger 1, the capacitive drive 2 is discharged to the inductor 3. At the same time, the magnetic field with induction Bg Ct is in the gap between the inductor and support 4. The magnetic field leaked through the shell material, liweeT induction B; (t). On induction coils of sensors 5 NSHZODITS. I voltage U (t), defined by the formula

dlBti)

(one)

Ulu -g

 S - effective surface of the roller

induction sensor.

Induction field В С) can be determined from measured values of U (t) either by number or grading () by one integrating, or directly, if the sensor is connected to a ballistic galvanometer or an integrated integrator.

Knowing the values of the field Bg Ct) and Bj (.t, it is possible to determine the pressure of the magnetic field acting on the shell by the well-known expression

where | u. - magnetic permeability of the shell material (for non-magnetic materials).

The accuracy of calculation formula (2) depends on the distortion of the inductor's magnetic field on the mounting area of the calibrated pressure sensor and its uniformity. Higher accuracy can be achieved by increasing the winding density of the windings, increasing the length, diameter and their ratio in the case of using cylindrical inductors, using special forms of inductors: flat, double winding, etc.

When choosing a pliable shell of a sufficiently thin pressured magnetic field, it is almost completely transmitted to the calibrated sensor 6, fixed in the dielectric case 7. In the proposed calibration method, there is no need to reconcile the acoustic impedances of the materials of the pliable shell and the sensitive pressure sensor

Claims (2)

Invention Formula 1, Method of dynamic calibration of pressure sensors, including the impact of a pulsed magnetic field on an electrically conductive. Separation element, the transmission pressure on the sensor's sensitive element and the measurement of the parameter used to calculate the calibrated pressure, compared to the sensor signal, and in order to improve the accuracy of the calibration, magnetic induction is measured as meter. 2. The device according to claim 1, comprising a capacitive drive, a gaiter, an inductor and an electrically conductive separating element, transmitting the pressure of the magnetic field, due to the fact that, to a greater extent than the calibration accuracy, the electrically conductive separation element is designed as a pliable shell, from the inside and outside of which there are magnetic induction sensors. Sources of information taken into account in the examination: 1. Shock pipes. Collected translations edited by A, X. Rakhmatulin, IL, 1962, with. 364-373. 2.Martin O-Stern and Edw / aru N Dacus, PicsoeeectHc Probe for Ptesma Research, tke Review of Sieriti / ic ittstrumentes, 32, No. 2, 1961, p. 14O to peeucmpi pi / ecneu appracesure The output of the dp1 chika gives in