Gas sensors and methods of controlling light sources therefor

Details Gas sensors and methods of controlling light sources therefor Gas sensors and methods of controlling light sources therefor

2007-09-06

2010-11-16

Pham, Hoa Q (Department: 2886)

Optics: measuring and testing

For light transmission or absorption

Of fluent material

Reexamination Certificate

active

07835004

ABSTRACT:
A gas sensor includes a light source, a power source in operative connection with the light source and a control system in operative connection with the light source and the power supply. The control system is adapted to control power input from the power source to the light source such that the time period of the control frequency is shorter than the thermal time constant of at least one of (i) the infrared light source, (ii) the gas within the sensor, or (iii) a detector of the sensor. The time period of the control frequency can, for example, be no greater than ⅓ of the thermal time constant, no greater than 1/10 of the thermal time constant, or even no greater than 1/20 of the thermal time constant. A feedback signal can be provided to the control system assist in achieving control.

REFERENCES:
patent: 3327139 (1967-06-01), Hillman
patent: 4632549 (1986-12-01), Czabaffy et al.
patent: 4755648 (1988-07-01), Sawa
patent: 4902958 (1990-02-01), Cook, II
patent: 5387979 (1995-02-01), Brauer et al.
patent: 2004/0145741 (2004-07-01), Cole et al.
patent: 2008/0024656 (2008-01-01), Huang
patent: 0584519 (1994-03-01), None
patent: WO 9853646 (1998-11-01), None
V. Jayaram Menon and Dulli C. Agrawal, Banaras Hindu University, Varanasi, India, “Switching Time of a 100 Watt Bulb,” Physical Education, vol. 34, No. 1, Jan. 1, 1999.

Affiliated with

Also associated with

Rating

Gas sensors and methods of controlling light sources therefor does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Gas sensors and methods of controlling light sources therefor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gas sensors and methods of controlling light sources therefor will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4213743