Apparatus and method for controlling light intensity

Details Apparatus and method for controlling light intensity Apparatus and method for controlling light intensity

1998-08-25

2000-09-05

Lee, John R.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250225, 250235, 250236, 347133, G02B 2610, H01S 310

Patent

active

06114682&

ABSTRACT:
A light intensity control apparatus includes an optical beam splitter which splits light into monitor light and principal light; a polarization beam splitter which splits the monitor light into two polarized light components; a monitor light detector which detects the polarized light components; a polarization correction device which corrects the output of the monitor light detector so that the intensity of the output signal of the monitor light detector and the light intensity of the principal light on an object surface have a predetermined correlation, regardless of the polarization state of the light incident upon the optical beam splitter; and a humidity dependency correction device which corrects the output of the monitor light detector via the polarization correction device by detecting a variation in polarization dependency characteristics of the optical beam splitter, caused by a change in humidity, and feeding the variation back to the polarization correction device, so that the output signal intensity of the monitor light detector and the light intensity of the principal light on the object surface have a predetermined correlation, regardless of a change in the humidity. The invention is also directed to a light intensity control method.

REFERENCES:
patent: 5233188 (1993-08-01), Arimoto et al.
patent: 5892219 (1999-04-01), Minakuchi et al.

Affiliated with

Also associated with

Rating

Apparatus and method for controlling light intensity does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Apparatus and method for controlling light intensity, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus and method for controlling light intensity will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2214646