Radiant energy – Photocells; circuits and apparatus – Flame light source
Patent
1985-01-04
1986-10-07
LaRoche, Eugene R.
Radiant energy
Photocells; circuits and apparatus
Flame light source
250227, 340577, 431 79, G01N 2100
Patent
active
046161376
ABSTRACT:
A fiber optics based optical emission line monitoring system is provided in which selected spectral emission lines, such as the sodium D-line emission in coal combustion, may be detected in the presence of interferring background or blackbody radiation with emissions much greater in intensity than that of the emission line being detected. A bifurcated fiber optic light guide is adapted at the end of one branch to view the combustion light which is guided to a first bandpass filter, adapted to the common trunk end of the fiber. A portion of the light is reflected back through the common trunk portion of the fiber to a second bandpass filter adapted to the end of the other branch of the fiber. The first filter bandpass is centered at a wavelength corresponding to the emission line to be detected with a bandwidth of about three nanometers (nm). The second filter is centered at the same wavelength but having a width of about 10 nm. First and second light detectors are located to view the light passing through the first and second filters respectively. Thus, the second detector is blind to the light corresponding to the emission line of interest detected by the first detector and the difference between the two detector outputs is uniquely indicative of the intensity of only the combustion flame emission of interest. This instrument can reduce the effects of interferring blackbody radiation by greater than 20 dB.
REFERENCES:
patent: 2840146 (1958-06-01), Ray
patent: 3146822 (1964-09-01), Ray
patent: 4408827 (1983-10-01), Guthrie et al.
Goff David R.
Notestein John E.
Breeden David E.
Hamel Stephen D.
Hightower Judson R.
LaRoche Eugene R.
Pascal Robert J.
LandOfFree
Optical emission line monitor with background observation and ca does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical emission line monitor with background observation and ca, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical emission line monitor with background observation and ca will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-644426