SU1647441A1 - Radiation indicator - Google Patents

Abstract

The invention relates to a measurement technique, in particular, to devices for detecting, measuring and recording the level of radiation of electromagnetic energy from various sources of pulsed modulated microwave oscillations, including radiation from microwave ovens. The aim of the invention is to increase the reliability and performance of radiation control with arbitrary polarization. In the radiation indicator from the outputs of two photolines of the vibrators 1 and 2, which form the turn antenna, pulsed microwave signals are acquired at the inputs of the corresponding microwave frequencies 3 and 4. To ensure a linear dependence of the output voltage of each of the microwave detectors 3 and 4 from The power flux, which determines the isotropy of the sensitivity of the radiation indicator to the angle of rotation of the antenna, includes correction circuits. From the outputs of the correction circuits, pulse signals of negative polarity are fed through capacitors 13 and 14 to the opera insulating amplifier 15 where they are summed and enhancing further the reference signal are compared with a threshold element 16. If pre Vyshen threshold level ignited LED 17. 2 yl. Lichta

Description

Pu, t.f

The invention relates to a measurement technique, in particular, to devices for detecting, measuring and recording the level of radiation of electromagnetic energy from various sources of pulse-modulated microwave oscillations, including radiation from microwave ovens,

The aim of the invention is to increase the reliability and performance of radiation control with arbitrary polarization.

FIG. 1 is a diagram of an electrical radiation indicator; in fig. 2 is a graph of the amplitude of the detected voltage at the anode of the microwave detector (Ump) versus the power flow density (WCp) incident on the antenna.

The radiation indicator contains main 1 and additional 2 half-wave vibrators, main 3 and additional 4 microwave detectors, first 5, second 6, third 7 and fourth 8 diodes, first 9, second 10, third 11 and fourth 12 resistors, main 13 and additional 14 coupling capacitors, operational amplifier 15, threshold element 16, and LED 17.

The radiation indicator works as follows.

From the outputs of two half-wave vibrators that form the turnstile antenna, the pulsed microwave signals are fed to the inputs of the corresponding microwave detectors 3 and 4, where they are converted into a low-frequency pulse signal, and the conversion factor

W

wed

varies by 2.5

times depending on the flux density of the power incident on the antenna WCp. To ensure the linear dependence of the output voltage of each of the microwave detectors on the power flow, which determines the isotropy of the sensitivity of the radiation indicator over the angle of rotation of the antenna, nonlinear correction circuits are included, one of which consists of the first and third diodes and the other from the second and fourth diodes.

In this case, the sum of the two detected signals (U j) of mutually perpendicular polarizations does not depend on the angle of rotation of the vibrators relative to the vector of electric intensity of the field E.

Really,

U Ki (+ K2 (EslnЈ) 2, where Ki and Ka are the transform coefficients

detectors.

When the condition Ki K2 K is fulfilled

 f (p).

From the outputs of the correction chains, pulsed signals of negative polarity are fed through the main 13 and additional 14 coupling capacitors to the non-inverting input of the operational amplifier 15, where they

are added together and enhanced. The amplitude of the positive part of the pulse signal at the output of the operational amplifier, equal to its average value, is compared with the reference signal of the threshold element 16.

When the threshold level corresponding to the permissible radiation level is exceeded, a single pulse logic signal is generated at the output of the threshold element 16, which lights the LED

17

Claims (1)

The invention The radiation indicator, containing a series-connected antenna in the form of a half-wave vibrator and a microwave detector, a coupling capacitor connected to the input of the operational amplifier, and a LED, characterized in that, in order to increase the reliability and performance of radiation monitoring with an arbitrary polarization, an additional half-wave vibrator, perpendicular to the main one, and a microwave detector, a threshold element, are introduced, the first and a second diode connected in series the first resistor, a third diode connected in the forward direction, and a second resistor connected in series the third resistor, a fourth diode connected in the forward direction and the fourth resistor, with the first terminals of the first and third resistors being connected to the positive bus power of the radiation indicator, second pins of the second and fourth resistors are connected to the common bus, the second output of the first resistor is connected to the anode of the first diode and the second output of the coupling capacitor, the second output of the third resistor is connected to the anode the second diode and through the additional dividing capacitor - with the input of the operational amplifier; the cathodes of the first and second diodes are connected respectively to the anodes of the main and additional microwave detectors, and the output of the operational amplifier is connected to the input of the threshold element, to the output of which the LED is connected. W9 20 40 Faye. 2 t vita (mokot (sp)