SU849087A1 - Microwave frequency continuous power meter - Google Patents

Description

MEASURING CONTINUOUS ULTRA-HIGH POWER

(54) FREQUENCY

This invention relates to a radio measurement technique.

A continuous microwave power meter is known that contains a control signal generator connected in series, an amplitude modulator, the second input of which is the input of the measured microwave signal, and a calorimetric power converter with a calibrator as well as an indicator 1.

However, the known meter requires a large measurement time.

The purpose of the invention is to reduce the measurement time.

This goal is achieved by measuring in a continuous microwave microwave, containing a series-connected control signal generator, an amplitude modulator, the second input of which is the input of the measured microwave signal, and a calorimetric power converter with a calibrator, as well as an indicator between the output of the calorimetric power converter and the input of the indicator are connected in series with an amplifier, an electronic switch and a conversion:; tel amplitude of pulses, while The third and third outputs of the control signal generator are connected to the second input of the electronic switch and the calibrator input, respectively.

FIG. 1 shows a functional diagram of the meter; in fig. 2 - stress diagrams for his work.

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Claims (1)

The microwave supercontinuous power meter contains a sequentially connected control signal generator 1, the amplitude modulator 2v whose second input is the input of the measured ultrahigh 15 hour signal, and a calorimetric power converter 3 with a calibrator 4, as well as an indicator 5 and connected in series between the output of the calorimetric Converter 3 power and the input of the indicator 5 torus 5 amplifier 6, the electronic switch 7 and the Converter 8 pulse amplitude, with the second and third output S: generator 1 of the control signal is connected, respectively, to the second input of the electronic switch 7 and the input of the calibrator 4. The meter operates as follows. When the Start command is given, the generator 1 outputs a modulating video impulse (Fig. 2a) to the input of the amplitude modulator 2 and a control pulse (Fig. 25) to the second input of the electronic switch 7. As a result, the pulse signal of the microwave signal arrives at the input of the calorimetric converter 3 ( Fig. 2c), which is converted in it as follows. From the beginning of the pulse, the signal U (t) at the output of the calorimetric converter 3 increases exponentially and (t) PX Cd (1-e L), where PX is the measured power; KU is the microwave power conversion factor into the signal level (for example, voltage) at the output of the calorimetric converter 3; t is the current time from the beginning of the pulse; e is the thermal calorimetric constant of converter 3. However, when t is set, U (t) PxKp / Cd, i.e., it has almost a linear character up to the end of the pulse (to). Thus, the amplitude increases to the value UQ of the pulse duration, first (for example, at C. 100 error%). At the end of the pulse, the calorimetric converter 3 begins to slowly cool down also exponentially, i.e. U (t) Uo. The received signal (Fig. 2d), after amplification in amplifier 6, is delivered to the input of the electronic switch 7, to the second input of which a control pulse is applied with a duration (Fig. 26), B. The output signal of the electrical switch 7 is also produced by the duration Q (Fig 2d). Since the duration of Co «, the peak of the pulse is almost flat, and the amplitude is almost equal to Uo (with this value to noTqjb in the electronic switch 7). Next, the received pulse is converted into a convenient type of information (constant voltage, code, frequency) in the pulse amplitude converter 8 and the measured power PXJ, which is equal to РХ UoiK, is indicated on the indicator 5. Due to the fact that Kp that during the time and with a sharp change in ambient temperature can change, it is necessary to calibrate on Cd, which is carried out directly before measurement with calibrator 4, which is made in the form of a single pulse generator, triggered by generator 1. The pulse power RK developed by the calibrator 4 on the resistance Rg of the calorimetric converter 3 (heating winding) is equal to the RC –gT where U is the pulse amplitude of the calibrator 4. With a JToro pulse duration equal to also ju and Td ,) 1X% «AJL ..fmtnft i. C ° "A-5g: ti and since U ,, Kn, C, Rg is const, then CHA K / NQ. Thus, the amplitude ujj can be used to judge the SD and adjust the readings of the indicator 5 accordingly. Thus, the proposed meter as compared to the known one can shorten the measurement time. Claims An ultrahigh-frequency continuous power meter comprising a sequentially connected charging signal generator, an amplitude modulator whose second input is an input of the measured microwave signal, and a calorimetric power converter with a calibrator, as well as an indicator that, in order to reduce measurement times, between the output of the calorimetric power converter and the input of the indicator, in succession, the amplifier, the electronic switch, and a pulse amplitude converter; the second and third outputs of the control signal generator are connected to the second input of the electronic switch and the calibrator input, respectively. Sources of information taken into account at expert gas 1. USSR author's certificate M, cl. G 01 R 21/00, 1966.