Apparatus and method of automatically zeroing an exhaust emissio

Details Apparatus and method of automatically zeroing an exhaust emissio Apparatus and method of automatically zeroing an exhaust emissio

1974-06-24

1976-01-27

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250343, G01N 2126

Patent

active

039354598

ABSTRACT:
The automatic output zeroing apparatus includes an energy storage device and a differential operational amplifier. The energy storage device, which is connected to one input of the differential operational amplifier, is charged to a voltage representing the free air voltage generated by the exhaust emission analyzer. The other input of the differential operational amplifier receives the pollution-indicating voltage generated by the exhaust emission analyzer. The differential operational amplifier produces a modified pollution-indicating voltage, representing the difference between the generated pollution-indicating voltage and the free air voltage.

REFERENCES:
patent: 3805074 (1974-04-01), McCormack
patent: 3832549 (1974-08-01), Mangan et al.

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