Measuring method, exposure apparatus, and device...

Details Measuring method, exposure apparatus, and device... Measuring method, exposure apparatus, and device...

2006-02-21

2008-12-16

Porta, David P. (Department: 2884)

Radiant energy

Invisible radiant energy responsive electric signalling

Including a radiant energy responsive gas discharge device

Reexamination Certificate

active

07465936

ABSTRACT:
A measuring method that utilizes a bandpass filter and a measurement apparatus to measure an intensity of light having a predetermined wavelength among lights emitted from a light source, the bandpass filter transmitting the light having the predetermined wavelength, the measurement apparatus measuring an absolute intensity of an incident light includes the steps of measuring an output of the measurement apparatus continuously, stopping or starting an emission of the light source in the measuring step, calculating a first extreme value t→t0−0 and a second extreme value t→t0+0 in the output of the measurement apparatus at time t0where t is time in the measuring step, and t0is time when the emission of the light source stops; and calculating a difference between the first extreme value t→t0−0 and the second extreme value t→t0+0.

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