Dead-time compensation for a logarithmic display rate meter

Details Dead-time compensation for a logarithmic display rate meter Dead-time compensation for a logarithmic display rate meter

1987-10-05

1988-09-20

LaRoche, Eugene R.

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

307234, G01T 118

Patent

active

047727934

ABSTRACT:
An improved circuit is provided for application to a radiation survey meter that uses a detector that is subject to dead time. The circuit compensates for dead time over a wide range of count rates by producing a dead-time pulse for each detected event, a live-time pulse that spans the interval between dead-time pulses, and circuits that average the value of these pulses over time. The logarithm of each of these values is obtained and the logarithms are subtracted to provide a signal that is proportional to a count rate that is corrected for the effects of dead time. The circuit produces a meter indication and is also capable of producing an audible indication of detected events.

REFERENCES:
patent: 3814937 (1974-06-01), Lowes
patent: 4288692 (1981-09-01), Schanber et al.
patent: 4292539 (1981-09-01), Todd
patent: 4311909 (1982-01-01), Utting et al.
patent: 4419579 (1983-12-01), East
patent: 4423329 (1983-12-01), De Burgos Garcia et al.
patent: 4491733 (1985-01-01), Wasserman
patent: 4617680 (1986-10-01), Johnston

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