SU1501688A1 - Photon counter - Google Patents

Abstract

The invention relates to the measurement of atmospheric parameters and can be used to register weak and super-weak fluxes in physics, laser sounding of the atmosphere, space research, spectroscopic and chemical research. The aim of the invention is to increase the accuracy of registration of photo pulses. Connecting the discriminator directly to the counting input of the pulse counter, and accumulating data to its information inputs allows, on the one hand, significantly reducing the pulse miscalculation by registering all (and not only the first) one-electron pulses in a given time interval on the other hand, to reduce the required amount of equipment by combining in the counter pulses the functions of fast RAM, adder and intermediate data register. I il. 3

Description

The invention relates to the measurement of atmospheric parameters and can be used to register weak and super-weak light fluxes in physics, atmospheric laser sensing, space research, spectroscopy, chemistry, etc.

The aim of the invention is to increase the accuracy of recording photopulses at a high intensity of the input stream a.

The drawing shows a functional diagram of the photon counter.

The photon counter contains a photoelectric multiplier (FZU), a discriminator of 2 single-electron pulses, an N-discharge counter of 3 pulses, accumulating random access memory (RAM) 14, an electronic computer b, and an address hchtchik 6. controllable clock geyag

Rator 7, trigger 8 mode, counter 9 the number of parcels, circuit 10 synchronization, the logical element OR II.

The output of the photomultiplier G is connected to the input of the discriminator 2 single-electron pulses, and its output is connected to the counting input of the N-parallel digital counter 3 pulses, its information outputs are connected to the information inputs of RAM 4, its information outputs are connected to the input register of the computer 5 and to the information 3. The sync pulse (start pulse) is fed to the first input of the IO synchronization circuit, its output is connected to the first input of the mode trigger 8 and to the input of the counter 9 the number of parcels, the output of the counter of the number of parcels is connected to the input of the RAM 4, to the stroke requirements interrupting computer 5, to the second input skhesl

O) 00 00

Mf.i I) sichroits and to the per log of the log of the element OR 1. The output of the tp is the ipl of the iio; u jTfi4en to nx mode (1Dy control of the control panel so that I o i-cucpa- torl 7, its output to the first input of the address counter in, its output to the second input of the HIIH II logic element, its output is to the second input of the trigger B mode. The address outputs of the address counter are connected to the address inputs {1: 1U D. The output of the computer 5 is connected to the second input of the address counter b,

The photon counter operates in the following manner: PC1M.

The pulse arriving from the synchronization circuit 10 triggers a controlled clock |. generator 7, from which to the local one; the fS counter begins to receive a hocopan frequency, changing its state successively. The death rate is registered in the 9th number of shipments counter. The trigger of the mode with the same pulse sets the RAM A to peAjiM Read. The data is read from the RAM And is written to counter 3, Then the RAM goes to the Record mode. Each single pulse from the discriminator 2 during this time interval increases the state of the counter by one 3, At the end of the time interval, the new count of 3 counter is written into the same cell of RAM 4. With the change in the state of the address counter h from the arrival of the next clock pulse from the controlled clock generator 7, the loop repeats Reading account record for the following snake RAM cell,

After passing through all possible conditions, the address counter generates a pulse, according to which the mode trigger goes into Stop mode - it stops the clock generator 7 and prepares it for synchronous start by the next synchronous pulse. After the number of the number of packages specified in the counter 9 is received, the requirement to receive accumulated RAM 4 data, while the signal from the output of the counter of the number of parcels goes through the logical element OR .1 1 to the second input of the trigger mode and transfers it to the Stop mode, to the second control input (re press) RAM 4, translating it, despite the continued receipt of a single electric

0 5 0

5 l

five

1 мп pulse тю тю тю тю в в - - Ч Ч,,,,,,,,,,, благодар благодар благодар благодар благодар благодар благодар благодар благодар благодар благодар благодар благодар благодар благодар благодар благодар благодар благодар The control impulses from the output computer register are fed to the second control input of the address counter, sequentially changing its state. Subsequent pulses are formed after the connection of the previous RAM cell A was read into the computer,

Thus, connecting the discriminator directly to the counting input of the counter of imguls, and accumulating data to its information inputs, allows, on the one hand, to significantly reduce the magnitude of miscalculation of pulses by registering n this time interval of all (and not just first) one-electron pulses, and on the other hand, to reduce the required volume of equipment by combining the functions of a fast RAM, an adder and an intermediate data register in a pulse counter.

The cycle of recording and accumulating data is combined; therefore, there is no need to form a cycle of a cycle of recording, in which the data obtained in the current implementation are added to the data accumulated in previous implementations. This makes it possible to shorten the tracking pulse period by about 2 times and by the same amount to reduce the methodological error of measuring atmospheric parameters, due to the fact that during the measurement time the state of the atmosphere changes.

Claims (1)

Invention Formula A photon counter containing a photomultiplier tube (PMT), a discriminator of single-electron pulses, an N-bit pulse counter, a random access memory {RAM computer, a timing circuit, a trigger mode, a controlled clock generator, an address counter, a tracking number counter, and a logical the element OR, and the output of the PMT is connected to the input of the discriminator of single-electron pulses,