Smoke detector with a radiation source operated in a pulse-like

Details Smoke detector with a radiation source operated in a pulse-like Smoke detector with a radiation source operated in a pulse-like

1983-05-05

1985-12-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250573, 340630, G01N 2100

Patent

active

045594538

ABSTRACT:
In a line extinction detector using a pulse-operated radiation source, a radiation receiver is connected to an input amplifier of an evaluation circuit. The output pulses generated by the input amplifier are compared to a reference voltage. Circuit elements having a time constant above one minute are provided to adjust either one of the voltage of the output pulses or the reference voltage such that their difference practically becomes zero. The output pulses of the input amplifier are further compared to an alarm threshold derived from the reference voltage and an alarm is triggered when the output signal falls below the alarm threshold value. The output pulses of the input amplifier are also compared to a disturbance threshold value and a disturbance signal is generated when the output signal drops below the disturbance threshold value. A further disturbance signal value is also triggered at preset limits for the compensating adjustment between the output signal of the input amplifier and the reference voltage. A device permits to change the ratio of the alarm threshold value and the reference voltage in order to adapt the sensitivity of the smoke detector to different distances between the radiation source and the radiation receiver.

REFERENCES:
patent: 4011458 (1977-03-01), Malinowski
patent: 4185278 (1980-01-01), Lintelmann et al.
patent: 4203100 (1980-05-01), Yamauchi et al.
patent: 4260984 (1981-04-01), Honma
patent: 4317113 (1982-02-01), Honma
Patent Abstracts of Japan, vol. 3, No. 34, Mar. 22, 1979, p. 127E99.

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