SU851482A1 - Differential method of registering physical parameter - Google Patents

Description

(54) DIFFERENTIAL METHOD FOR REGISTRATION OF PHYSICAL PARAMETER

one

The invention relates to instrumentation, in particular, to a differential method of registering a physical parameter on a carrier, for example magnetic, or recording using indicating devices.

There is a known method of misalignment and determination of the temporal mismatch of signals reproduced from a magnetic carrier, based on the registration of two or more parameters at the same time, in which a phase difference of a certain angle of rotation is used. The mean value of the parameter is determined using the value of the inverse difference of adjacent frequencies, where each frequency is a separate physical parameter 1.

However, this method is relatively complicated and, moreover, not every parameter is acceptable, i.e. narrowly functional

A known method for determining the mutual parameters of the tape-carrying mechanisms of magnetic recording apparatus 2.

This method is more universal, since practically any dynamic parameter of mechanics can be used to find an electrical equivalent, but in its implementation it is necessary as one of the variables, i.e. the parameter that changes its coordinates, use a magnetic tape. This is not always convenient, since not in any laboratory there is a magnetic recording apparatus.

The closest to the proposed method is the differential method of registering a physical parameter based on the transformation of two primary signals with their subsequent formation in the form of the difference of output signals 3.

This is the simplest of all known methods, but with its help it is impossible to register the second parameter simultaneously with the first one so that for each parameter separate data can be obtained.

20

The purpose of the invention is the implementation of the possibility of registering a second physical parameter.

The goal is achieved by the fact that in the differential method of registering a physical parameter based on the preliminary transformation of two primary signals with their subsequent formation as a difference of output signals, two compensating signals with different signs are formed from the result of the difference of signals, compensate for the mismatch of the specified output signals of them register as an information signal of the second physical parameter.

The drawing shows a device that implements the proposed method, the structural scheme.

The device uses a differential sensing element 1, the various outputs of which through primary measuring transducers 2 and 3 are connected to the error indicator 4, the output of which is connected through serially connected three-position sign relay 5 and the differential signal shaper 6 connected to the shaper signals 7 and 8, and also to the output bus 9. The input signals to the device come in 10 and 11, and the control signal through the bus 12.

A differential strain gauge is used as a sensing element, a force acting on the sensor is used as a registered parameter, and ambient temperature, humidity, radiation, etc. are used as the second physical parameter.

Signals from two parameters, in this case from a strain gauge and, for example, a device that reacts to the ambient temperature (not shown), come to the input of the 10 and 11 teams. Both signals fall on the error indicator, which generates a common signal proportional to the difference between the signals present at the output of converters 2 and 3. This common signal controls the state of relay 5, which affects the operation of shaper 6. As a result, at the output of this shaper there is a signal which is the work parameter of the strain gauge, and the output of the converter 3 is a signal that carries information about the second parameter, i.e. about temperature

environment or the magnitude of the effect of this temperature on any other parameter. Those. two completely independent signals arise from each other, each of which carries its own information,

At the same time, they show some dependence of these signals among themselves from the point of view of their influence on the common registered main parameter. Two received signals can be recorded on different tracks of magnetic media, if the combined modulation type (FM-AM, PIM-AIM, etc.) is performed, the signals of both parameters can be recorded on one track, which significantly saves the carrier consumption.

Thus, the use of the proposed method in any particular device makes it possible, with a rather simple technical solution, to obtain information about two parameters that act on a controlled object that is correlated

reduces the cost of building an electrical circuit.

Claims (3)

1. USSR author's certificate No. 489145, cl. G 11 B 5/02, 1974. 2. USSR author's certificate number 477451, cl. G 11 B 5/00, 1974. 3. USSR author's certificate No. 305417, cl. G 01 R 17/00, 1970 (prototype). / V BUT to "3 7