SU478260A2 - Device for measuring microwave power - Google Patents

Description

(34) DEVICE FOR MEASURING MICROWAVE

one

The invention relates to a measurement technique, in particular, to devices for measuring microwave power.

By ocHOBHON.y auth. The K 27O886 is a well-known device for measuring the RV H-power. However, the known devices do not have sufficient accuracy.

The purpose of the invention is to improve the accuracy of the device.

This is achieved by adding a power divider connected to the meter input to the devices, and a sawtooth generator, the input of which is connected via a control circuit to the comparator, and the output via a switch connected to the sensing element of the thermistor bridge and the input of the upper unit.

The drawing shows a block diagram of the proposed device.

The device contains a power divider 1, connected via a switch 2 with sensitive elements to the element of a thermistor bridge 3, the output of which is connected via an electoral amplifier 4 to output 5. 5. The output of the rectifier is connected to one of the outputs of the comparator 6 directly, and to the second input through the integrator 7. The output of the comparator through the control circuit 8 is connected to the saw-tooth voltage generators 9 and 1O, the outputs of which are connected via switch 13 to the sensitive element of the bridge thermometer and also through the reader; 11c to the indicator 12.

The device works as follows.

After supply voltage is applied and. the end of the transient processes at the output of the selective amplifier 4 is set at a constant voltage a1 to the voltage that goes to the rectifier 5. During the time that the microwave power arrives through the switch 2 to the sensing element of the thermistor bridge 3, the rectified input voltage is stored at the integrator 7 and applied to the second input of the comparator 6, where it is compared with the rectified voltage with the SEC power turned off;

3

the rectified voltage is reduced by the action of the thermistor bridge supplied from the sawtooth generator 9 to the first measurement cycle through the dc switch 13, which rises to the moment of comparison of the voltages on the comparator 6. Throughout the control circuit 8, the sawtooth generator 1 stops voltage 9 and connects a subtracting unit 11 for measuring and storing the output voltage of the generator 9.

In the second cycle of the SECh measurement, the capacity arrives at the sensing element of the thermistor bridge 3 through the power divider 1 with a coe (}) 4) by the division member K p. The process of registering the microwave power supplied by the thermistor is identical the replacement of the microwave power is produced by direct current from the go} of the ramp voltage generator 10, whose parameters are j

G -. .

in Kp there are more times than generator 9.: The output voltage of generator 1O is recorded by subtractive unit 11. The difference obtained in subtractive unit 11 is indicated by device 12 and is a measure of the measured power.

Subject invention

Device for measuring microwave power St. N ° 270886, about tl ich and y 1U e e with the fact that, in order to improve accuracy, it additionally

the introduction of a moniousty divider connected to the input of the meter, and a sawtooth generator, the input of which is connected through the 1A circuit to the comparator, and the output through the switch

It is not equipped with the sensitive element TCOfJiioro of the bridge and the input of the subtraction unit.