SU794748A1 - Measured value transmission device - Google Patents

Description

The invention relates to radio engineering and can be used in devices for remote monitoring of environmental parameters.

A known device for transmitting measured values, comprising a request signal transmitter, the output of which is connected to an inductive loop, and the input is connected through a recording unit to a control unit, the measured value receiver output and an indication unit input, a measured value sensor consisting of a measuring element are connected to the recording unit, connected through the converter to the transmitter of the measured values, the power supply connected to the decoder, the input of which is connected to the antenna [1] ·

However, the known device has a high level of interference.

The purpose of the invention · .— to reduce the level of interference.

To this end, in a device containing a request signal transmitter, the output of which is connected to an inductive loop, and the input is connected through a recording unit to a control unit, the measured value receiver output and an indication unit input, a measured value sensor, consisting of a measuring element, are connected to the registration unit connected via a converter to a transmitter of measured values, a power supply connected to a decoder, the input of which is connected to the antenna, the output of the power supply through a switching element is connected to by the developer and transmitter of the measured values, and the input of the receiver of the measured values is connected to the inductive 10 loop, and the input of the switching element is connected to the output of the decoder.

In FIG. 1 shows a structural electrical diagram of the proposed device; in FIG. 2 — timing diagrams explaining his work.

The device comprises a request signal transmitter 1, a measured value receiver 2, a recording unit 3, an indication unit 4, a control unit 5, an inductive loop 6 and a measured value sensor 7, consisting of an antenna 8, a decoder 9, a switching element 10, a power supply unit 11, a transmitter 12 of measured values, a transducer 13, a measuring element 14, and an antenna 15.

The device operates as follows.

The number of sensors 7 can be arbitrary; it is determined by the number of required X .¾.

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794748dimensional control points, the area of the controlled object.

When measuring the temperature in a certain place (from a specific sensor 7), the operator dials the sensor number on block 5.

In this case, a code package is generated corresponding to this number, which is transmitted through the transmitter 1 to the inductive loop 6.

The signal is fed to the input of the decoder 9. When the code is matched with the cipher (number) of the sensor 7, a signal appears at the output of the decoder 9, allowing the power supply from block 11 through element 10 to transmitter 12 and converter 13.

Timing diagrams of the proposed device are shown in FIG. 2:

a. is the request signal at the output of transmitter 1, where to is the beginning of the request, (ι is the end of the code message, b is the signal at the input of element 10;

in - the supply voltage on the stages of the transmitter 12 and the Converter 13, where the interval t \ - t ₂ - the increase in voltage on the capacitive elements of the power filters;

( ₂ - t ₃ - operating mode;

g - a radio pulse at the output of the transmitter 12 (in the antenna 15 and at the input of the receiver 2);

d - signal at the input of block 3 (amplified, percent, formed into pulses);

e - signal at the input of block 4.

Since the transmitter 12 exists at the initial moment of frequency run-out, in order to avoid measurement error from the package, the interval At ((4 --- (5) when the transmitter 12 is operating in steady state) is cut out.

The interval ( ₂ - (4 is chosen experimentally, based on the parameters of all sensors /, which have a certain spread.

In block 4 there is a counter that counts the number of pulses in the interval At. The accuracy of the At installation determines the accuracy of determining the temperature; therefore, the equipment should provide acceptable limits for changes in this reference interval.

You can set the mode of operation "Automatic polling", in which all the sensors 7 are interrogated in turn. Information can be displayed on display elements or through a transition device to an automatic digital printing device, to other information recorders.

Claims (1)

control points, the area of the controlled object. When measuring the temperature in a certain place (from a certain sensor 7), the operator dials the sensor number on block 5. This creates a code message corresponding to this number, which is transmitted through transmitter 1 to inductive loop 6. The signal arrives at the input of decipher 9. When the code value matches A parcel with the cipher (number) of the sensor 7 at the output of the decoder 9 appears a signal allowing the power supply from the block 11 through the element 10 to the transmitter 12 and the converter 13. The timing diagrams of the proposed device lead in FIG. 2: a is the request signal at the transmitter output 1, where / o is the beginning of the request, ti is the end of the code message, b is the input signal of the element 10; c is the supply voltage at the stages of the transmitter 12 and converter 13, where the interval ti - / 2 is the voltage rise at the capacitive elements of the power supply units; 2 - 3 - working mode; g - radio pulse at the output of the transmitter 12 (in the antenna 15 and at the input of the receiver 2); d - signal at the input of block 3 (amplified, designed, formed into pulses); e is a signal at the input of block 4. Since transmitter 12 has a frequency start at the initial moment, then, in order to avoid measurement errors, the interval A () is cut out of the burst when transmitter 12 is operating in steady state. The interval fa - 4 is selected experimentally by the 1st path, based on the parameters of all sensors 7, which have a certain scatter. In block 4, there is a counter that counts the number of pulses in the interval. The accuracy of the installation A / determines the accuracy of the determination of the temperature, therefore, the equipment must ensure the permissible limits of variation of this reference interval. The "Auto Polling" mode of operation is possible, in which all sensors 7 are polled alternately. Information can be displayed on the display elements or via an adapter to an automatic digital printing device, to other information recorders. The invention The device for transmitting measured values, containing the transmitter of a query query, the output of which is connected to an inductive loop, and the input is connected through a registration unit to a control unit, the output of the receiver of measured values and the input of the display unit, measuring sensor A measuring unit connected through a converter to the transmitter of measured values, a power supply unit connected to a decoder, the input of which is connected to an antenna, characterized in that To reduce the noise level, the output of the power supply unit is connected via a switching element to the transmitter and transmitter of measured values, and the input of the receiver of measured values is connected to an inductive loop, and the stroke of the switching element is connected to the output of the decoder. Sources of information taken into account during the examination 1. French Patent No. 21278G54, cl. G 01 D 5/00, G 01 M. 15/00, 1972 (prototype). riT and one