SU621215A1

SU621215A1 - Device for accounting count lossess in spectrometer

Info

Publication number: SU621215A1
Application number: SU762385603A
Authority: SU
Inventors: В.И. Шипилов
Original assignee: Предприятие П/Я М-5881
Priority date: 1976-07-15
Filing date: 1976-07-15
Publication date: 1981-07-30

Description

1one

Изобретение относитс к области дерной радиоэлектроники и может быть использованодл учета потерь счета в прецизионных спектрометрах дерных излучений.The invention relates to the field of nuclear electronics and can be used to account for the loss of the account in precision nuclear radiation spectrometers.

Известно устройство дл учета потерь счета в спектрометре, содержащее генератор реального времени, счетчик, аналого-цифровой преобразователь (АЦП), счетчик живого времени, ключи и запоминающее устройство 1 A device for counting account losses in a spectrometer is known, comprising a real-time generator, a counter, an analog-to-digital converter (ADC), a live time counter, keys, and a memory device 1

Известно устройство коррекции многоканальных распределений на мертвое врем анализатора, основанное на измерении отношени реального и нсивого времени анализатора за интервал времени, в течение которого изменение загрузки находитс в пределах, задаваемых точностью коррекции, и прибавлении полученного отношени к содержимому соответствующего канала при регистрации каждого импульса 2.A device for correcting the multichannel distributions for an analyzer's dead time is known, based on measuring the ratio of real and non-analyzer time for the time interval during which the load change is within the limits specified by the correction accuracy and adding the received ratio to the content of the corresponding channel when each pulse is recorded 2.

Известное устройство содержит генератор реального времени, ключ, АЦП устройство определени отношени частот , регистр, арифметическое устройство и режектор наложений. Основным недостатком устройства вл ет.с недостаточна точность измерени при высоких входных скорост х счета.The known device comprises a real-time generator, a key, an ADC device for determining the frequency ratio, a register, an arithmetic unit, and an overlap notch. The main drawback of the device is the lack of measurement accuracy at high input count rates.

Целью изобретени вл етс увеличение точности измерений при высокой загрузке.The aim of the invention is to increase the measurement accuracy at high load.

Это достигаетс тем, что в устройство введены триггер, единичный вход которого соединен с выходом генератора , два управл емых ключа, управл ющие входы которых соединены с выходом триггера, формирователь задерж0 ки, схема совпадений, схема ИЛИ и лини задержки, выход которой соединен со входом ключа, а вход подключен к выходу схемы ИЛИ, входы которой соединены coojBeTCTBeHHO с выходом схе5 мы совпадений и с выходом управл ющего ключа, вход которого подключен к выходу генератора, а вход другого управл емого ключа соединен с временным выходом режектора наложений, This is achieved by introducing a trigger into the device, the unit input of which is connected to the generator output, two controllable keys, the control inputs of which are connected to the trigger output, the delay shaper, the coincidence circuit, the OR circuit and the delay line, the output of which is connected to the input key, and the input is connected to the output of the OR circuit, whose inputs are connected to the coojBeTCTBeHHO with the output of the coincidence circuit and to the output of the control key, whose input is connected to the output of the generator, and the input of another control key Layer Overlays

0 а выход управл емого ключа соединен соответственно с нулевым выходом триггера и входом формировател згщержки , выход которого соединен со входом схемы совпадений, другой вход 0 and the output of the controlled key is connected respectively to the zero output of the trigger and the input of the trigger generator, the output of which is connected to the input of the coincidence circuit, another input

5 которой соединен с другим выходом режектора наложений.5 which is connected to another output of the overlapping rejector.

Функциональна схема предлагаемого устройства приведена на чертеже.The functional diagram of the proposed device is shown in the drawing.

Устройство содержит генератор 1 The device contains a generator 1

Claims

0 real time, key 2, device 3 determining the frequency ratio, register 4, device 5 transmitting the code to the arithmetic device, spectrometric amplifier 6 / notch 7 impositions with two outputs 8 and 9 emitting pulses corresponding in time to each spectrometric signal, respectively ; trigger 10, controllable keys 11 and 12, delay generator 13, coincidence circuit 14, circuit OR 15, delay line 16. The device works as follows. The time pulses from the generator 1 arrive at equal intervals of time and set the trigger 10 into a single state; in this state the keys 11 and 12 are opened. The first impulse from the generator A does not pass through key 12 due to a delay in trigger 1. If a temporary impulse from the output 8 of the overrun 7 passes through the period between the pulses of the generator 1, then this impulse passes the key 11 and returns the trigger 10 to its initial state the The pulse passed through the key 11 is delayed during the time when the rejector is in the delay forming unit 13 and is checked for overlap by matching the pulse with the delay forming unit 13 and the pulse from the output 9 of the rejector 7 overlays in the coincidence circuit 14. Imposed pulse does not appear at the output of the circuit 14 matches. The superimposed pulses from the coincidence channel and the channel of the key 12 pass the OR circuit and are delayed in the delay lines 16 for such a time that the events of the received superimposed pulses at the input of the key 2 and the AI events are open at the control input of the key 2 are statically independent. Thus, the periodic frequency of the oscillator 1 is converted into an equal static frequency minus those cases when there are no time pulses from the output 8 of the generator not 1 overlap between the pulses of the oscillator 1. The static frequency is considered overlap so that the relative loss of counting due to the overlaps in the spectrometer and the relative loss in the static frequency are equal. The number of pulses in a given period of time elapsed through key 2 due to overlapping and prohibiting part of the generator pulses is less and, therefore, the ratio of the frequency of generator 1 to the frequency transmitted by key 2 in device 3 is increased by a number proportional to the superimpositions in the spectrometer. The contents of register 4 are also increased so that instead of adding one to the contents of the corresponding channel in the current time interval, the contents of register 4, corrected (increased) by the number of overlays in the spectrometer, are added to it. Since the superimposed pulses in the spectrometer are not analyzed, i.e. the shape of the spectrum is preserved, then the incremental increase in the contents of register 4 makes it possible to obtain a measurement result corrected by the current change in counting loss due to the superposition of pulses in the spectrometer. Claims The device for counting losses in the spectrometer, comprising a generator, a key, a device for determining the frequency ratio, a register, a code transmission device, a two-output overlap notch and a spectrometric amplifier, characterized in that, in order to increase the accuracy of measurements at high load, the device is entered a trigger whose single input is connected to the generator output, two controllable keys, the control inputs of which are connected to the trigger output, delay generator, coincidence circuit, OR circuit and l neither the delay, whose input is connected to the key input, but the input is connected to the output of the OR circuit, whose inputs are connected respectively to the output of the coincidence circuit and to the output of the control key, whose input is connected to the generator output, and the input of another control key with the temporary output of the overlap notch, and the output of the controlled key is connected respectively to the zero output of the trigger and the input of the delay generator, the output of which is connected to the input of the coincidence circuit, another input of which is connected to another output of the notch overlays. Sources of information taken into account in the examination 1. Analyzer AI-256-6 (technical description), M., 1974.

2. Authors certificate of the USSR 446858, kl.S 01 T 1/36, 02.01.73 (prototype).

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