TECHNOLOGIES & APPLICATIONS

MICROWAVE CALORIMETER

The microwave calorimeter is used for measuring the energy of nano- and microsecond X-band high-power microwave pulses. The operation of the calorimeter is based on the expansion of the working liquid due to microwave energy absorption in the liquid. Coincident with energy measurement, recording of the microwave pulse shape is possible for which a detector connected to the coupling outlet of the calorimeter is used. With a calibrated detector, it is possible to estimate the peak power by known transmitting factor from the calorimeter input to the output.

The colorimeter comprises a microwave absorbing load, a video camera and a TV set with power supplies, a heater of the working liquid in the measuring unit, a calibrator, and a set of connecting cables.

Control of preliminary heating of the working liquid in the absorbing load and zero adjustment of the calorimeter for calibration and for measurement of the microwave energy are realized in the manual mode. The output signal is recorded using the video camera and the TV set. The calorimeter is vacuumized and is connected to the output waveguide of a microwave oscillator.

Parameters of the calorimeter
Operating frequency range	9–11 GHz
Microwave peak power	up to 2 GW
Maximum measurable microwave energy	190 J
Minimum measurable microwave energy	10 J
Working liquid	ethanol-based
Microwave reflection coefficient from the absorbing load	no greater than –15 dB
Measurement error for microwave energy	no greater than ± 20 and ± 10 % for the minimum and maximum measurable energies, respectively

For further information please contact:

Vladislav V. Rostov
Dr. Sci. (Phys. & Math.), Department Head

Phone: (3822) 49-16-41
Fax: (3822) 49-21-34
E-mail: rostov@lfe.hcei.tsc.ru

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