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Title: LINEAR COUNT-RATE METER

Abstract

A linear count-rate meter is designed to provide a highly linear output while receiving counting rates from one cycle per second to 100,000 cycles per second. Input pulses enter a linear discriminator and then are fed to a trigger circuit which produces positive pulses of uniform width and amplitude. The trigger circuit is connected to a one-shot multivibrator. The multivibrator output pulses have a selected width. Feedback means are provided for preventing transistor saturation in the multivibrator which improves the rise and decay times of the output pulses. The multivibrator is connected to a diode-switched, constant current metering circuit. A selected constant current is switched to an averaging circuit for each pulse received, and for a time determined by the received pulse width. The average output meter current is proportional to the product of the counting rate, the constant current, and the multivibrator output pulse width.

Inventors:
Publication Date:
Research Org.:
Originating Research Org. not identified
OSTI Identifier:
4843603
Patent Number(s):
US 2999168
Assignee:
U.S. Atomic Energy Commission DTIE; NSA-15-027842
NSA Number:
NSA-15-027842
Resource Type:
Patent
Resource Relation:
Other Information: Orig. Receipt Date: 31-DEC-61
Country of Publication:
United States
Language:
English
Subject:
ENGINEERING AND EQUIPMENT; CIRCUITS; COUNTERS; DIGITAL SYSTEMS; DIODES; ELECTRIC METERS; ELECTRICITY; MULTIVIBRATORS; PULSE ANALYZERS; RATE METERS; SWITCHES; TRANSISTORS

Citation Formats

Henry, J.J.. LINEAR COUNT-RATE METER. United States: N. p., 1961. Web.
Henry, J.J.. LINEAR COUNT-RATE METER. United States.
Henry, J.J.. Fri . "LINEAR COUNT-RATE METER". United States. doi:.
@article{osti_4843603,
title = {LINEAR COUNT-RATE METER},
author = {Henry, J.J.},
abstractNote = {A linear count-rate meter is designed to provide a highly linear output while receiving counting rates from one cycle per second to 100,000 cycles per second. Input pulses enter a linear discriminator and then are fed to a trigger circuit which produces positive pulses of uniform width and amplitude. The trigger circuit is connected to a one-shot multivibrator. The multivibrator output pulses have a selected width. Feedback means are provided for preventing transistor saturation in the multivibrator which improves the rise and decay times of the output pulses. The multivibrator is connected to a diode-switched, constant current metering circuit. A selected constant current is switched to an averaging circuit for each pulse received, and for a time determined by the received pulse width. The average output meter current is proportional to the product of the counting rate, the constant current, and the multivibrator output pulse width.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Sep 01 00:00:00 EDT 1961},
month = {Fri Sep 01 00:00:00 EDT 1961}
}
  • A counting-rate meter system is designed for a substantially linear output with rates from I up to 100,000 cps. In this system, the input pulses are fed into a discriminator and then into a trigger circuit which converts the pulses to positive pulses of uniform width and amplitude. The output from the trigger circuit is fed into a oneshot multivibrator and then into a special diode- switched, constant-current metering circuit. (D.L.C.)
  • A count-rate compensating circuit is provided which may be used in a portable Geiger-Mueller (G-M) survey meter to ideally compensate for couting loss errors in the G-M tube detector. In a G-M survey meter, wherein the pulse rate from the G-M tube is converted into a pulse rate current applied to a current meter calibrated to indicate dose rate, the compensation circuit generates and controls a reference voltage in response to the rate of pulses from the detector. This reference voltage is gated to the current-generating circuit at a rate identical to the rate of pulses coming from the detectormore » so that the current flowing through the meter is varied in accordance with both the frequency and amplitude of the reference voltage pulses applied thereto so that the count rate is compensated ideally to indicate a true count rate within 1% up to a 50% duty cycle for the detector. A positive feedback circuit is used to control the reference voltage so that the meter output tracks true count rate indicative of the radiation dose rate.« less
  • A count-rate compensating circuit is provided which may be used in a portable Geiger-Mueller (G-M) survey meter to ideally compensate for counting loss errors in the G-M tube detector. In a G-M survey meter, wherein the pulse rate from the G-M tube is converted into a pulse rate current applied to a current meter calibrated to indicate dose rate, the compensated circuit generates and controls a reference voltage in response to the rate of pulses from the detector. This reference voltage is gated to the current-generating circuit at a rate identical to the rate of pulses coming from the detectormore » so that the current flowing through the meter is varied in accordance with both the frequency and amplitude of the reference voltage pulses applied thereto so that the count rate is compensated ideally to indicate a true count rate within 1% up to a 50% duty cycle for the detector. A positive feedback circuit is used to control the reference voltage so that the meter output tracks true count rate indicative of the radiation dose rate.« less
  • A count-rate compensating circuit is provided which may be used in a portable geiger-mueller (G-m) survey meter to ideally compensate for counting loss errors in the g-m tube detector. In a g-m survey meter, wherein the pulse rate from the g-m tube is converted into a pulse rate current applied to a current meter calibrated to indicate dose rate, the compensated circuit generates and controls a reference voltage in response to the rate of pulses from the detector. This reference voltage is gated to the current-generating circuit at a rate identical to the rate of pulses coming from the detectormore » so that the current flowing through the meter is varied in accordance with both the frequency and amplitude of the reference voltage pulses applied thereto so that the count rate is compensated ideally to indicate a true count rate within 1% up to a 50% duty cycle for the detector. A positive feedback circuit is used to control the reference voltage so that the meter output tracks true count rate indicative of the radiation dose rate.« less