SU409168A1 - DEVICE FOR MONITORING THE BASE LEVEL IN THE SPECTROMETER - Google Patents

Description

The invention relates to the field of nuclear electronics and can be used in ionizing radiation spectrometers.

Monitoring the state of the baseline in ionizing radiation spectrometers is necessary in order to eliminate the distortion of the amyllitic information that occurs due to the imposition of emulsions.

BACKGROUND OF THE INVENTION There are known devices for monitoring a base level, cocTOHHie, from a spectrometric amplifier, a normally open (i.e.) linear transmission circuit, a latency delay and a unipolar threshold trigger circuit. In these devices, when the base level deviates from the stationary one, a threshold sius scheme is triggered, producing a signal at the output that is close to the same time as the total time of the deviation from the base level. This signal controls the passage of spectrometric signals through the transmission circuit.

However, the lime devices are designed only for one polarity of the base level flaking, and the release circuits in them have a high triggering level, which entails the need for significant amplification of the current to ensure sufficient sensitivity of the device.

The purpose of the invention is to increase the sensitivity to different ionic deviations of the base level, regardless of the method of forming the spectrometric signals.

The goal is achieved by the fact that P. proposed device between the output of the delay line and the input}, the threshold trigger circuit introduced an auto-oscillator with a tunnel dna and a high-frequency receiver connected via a separating capacitor.

The drawing shows a block diagram of the proposed device. It contains a spectrometric amplifier /, and. about. nrojuskine 2 linear circuit, delay line, self-oscillating generator 4 pas diode, separation capacitance 5, high-frequency receiver 6 and threshold trigger circuit 7.

The device works as follows.

From the output of the spectrometric amplifier / signals iodine simultaneously to the inputs cxe.U) of output 2 and through the delay line 3 to the generator 4, operating in the generator mode and in this case an element determining the deviation of the base level.

High-frequency signals (20-50 MHz) are fed through dividing capacitance 5 to rectifier 6, which is connected by a direct current to the threshold trigger circuit 7, which controls the linear output circuit. As long as the baseline stationary state remains, a certain constant voltage level is kept at the output of the rectifier 6, the low-voltage device 7 is in one position and allows any pulse to pass through the transmission circuit 2.

Insignificant deviations of any polarity of the baseline from its stationary level cause the operating point of the generator 4 to shift, as a result of which the generation stops, the voltage at the output of the rectifier 6 quickly drops to zero, the threshold circuit 7 is triggered and the transmission circuit 2 closes without skipping distorted signals.

The delay line 3 ensures the normal passage of the spectrometric signal, if it originated at a stationary base level. The line can be eliminated by selecting the inertia of the high-frequency rectifier 6.

The proposed scheme makes it possible, with high efficiency, to eliminate the distortion of amnlithia nnformacine, resulting in significant input loads in spectrometers, of high resolution.

Subject invention

A device for monitoring the base level in the spectrometer, containing an amplifier connected to the inputs of a normally open linear transmitting circuit and a delay line, and a unipolar opening circuit, characterized in that, in order to increase the sensitivity to differences in basic deviations

The level, between the output of the delay line and the input of the threshold trigger circuit, includes an auto-oscillator on the tunnel diode and a high-frequency rectifier connected in series through a separation capacitor.