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Class Information
Number: 250/575
Name: Radiant energy > Photocells; circuits and apparatus > Optical or pre-photocell system > Fluent material in optical path > Plural paths
Description: Subject matter including more than one optical path or separate fluent materials in one optical path.

Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8711353 Fluid-borne particle detector Apr. 29, 2014
8701746 Optically detected liquid depth information in a climate control unit Apr. 22, 2014
8570512 System, storage mediums, and methods for identifying particles in flow Oct. 29, 2013
8433526 Method and system for steam quality monitoring Apr. 30, 2013
8319965 Method and apparatus for measuring a position of a particle in a flow Nov. 27, 2012
8299449 Apparatus and method for environmental monitoring Oct. 30, 2012
8289178 Electro/optical smoke analyzer Oct. 16, 2012
8171777 Systems, storage mediums, and methods for identifying particles in flow May. 8, 2012
8055471 Method of discriminating particle groups and particle analyzer Nov. 8, 2011
7977660 Article, device, and method Jul. 12, 2011
7968860 System and method for measurement of degree of moisture stratification in a paper or board Jun. 28, 2011
7879619 Apparatus for detecting one or more substances and method of detecting a substance Feb. 1, 2011
7863568 Photosensitive sensor in the automotive field Jan. 4, 2011
7821636 Method and apparatus for measuring a position of a particle in a flow Oct. 26, 2010
7658884 Photometric method and apparatus for measuring a liquid's turbidity, fluorescence, phosphorescence and/or absorption coefficient Feb. 9, 2010
7586114 Optical cavity system having an orthogonal input Sep. 8, 2009
7493219 Method of discriminating particle groups and particle analyzer Feb. 17, 2009
7468523 Raindrop detection apparatus having lens unit larger than radius of reflected light Dec. 23, 2008
7375348 Micro UV detector May. 20, 2008
7365303 Optical sensor device to be installed on board a motor-vehicle for aid in driving and/or for automatic activation of systems provided on the motor-vehicle Apr. 29, 2008
7259384 Fluid level optical detector with float having opaque and transmissive portions Aug. 21, 2007
7221288 Method and apparatus for using optical signal time-of-flight information to facilitate obstacle detection May. 22, 2007
7167099 Compact particle sensor Jan. 23, 2007
6921899 Gas cell with reflected light bundles Jul. 26, 2005
6876305 Compact particle sensor Apr. 5, 2005
6803594 Measuring system for optically determining concentration of turbid liquid samples Oct. 12, 2004
6801875 Methods, systems, and software for performing measurements Oct. 5, 2004
6600559 On-line method for detecting particle size during a milling process Jul. 29, 2003
6509567 Method and apparatus for detecting gases Jan. 21, 2003
6480276 Enhanced photon-migration methods for particle sizing in concentrated suspensions Nov. 12, 2002
6411383 Method for measuring the 2nd virial coefficient Jun. 25, 2002
6404494 Measurement of the lidar ratio for atmospheric aerosols using a 180 degree-backscatter nephelometer Jun. 11, 2002
6326897 Smoke detector Dec. 4, 2001
6225910 Smoke detector May. 1, 2001
6219138 Particle sizing technique Apr. 17, 2001
6198110 Method and apparatus for the real-time characterization of particles suspended within a fluid medium Mar. 6, 2001
6191853 Apparatus for measuring particle size distribution and method for analyzing particle size distribution Feb. 20, 2001
6181419 Method and apparatus for applying laser induced incandescence for the determination of particulate measurements Jan. 30, 2001
6154277 Absolute intensity measurements in laser induced incandescence Nov. 28, 2000
6084519 Multi-function light sensor for vehicle Jul. 4, 2000
6023070 System and method to monitor for fouling Feb. 8, 2000
5977546 Self normalizing radiant energy monitor and apparatus for gain independent material quantity measurements Nov. 2, 1999
5953145 Multiple light path arrangement Sep. 14, 1999
5872634 Optical smoke detector operating in accordance with the extinction principle Feb. 16, 1999
5831730 Method for monitoring particulates using beam-steered solid-state light source Nov. 3, 1998
5827660 Caged fluorochrome-labeled probes and subtraction of autoflourescence background Oct. 27, 1998
5822071 Spectrometer normalization system Oct. 13, 1998
5796481 Suspended particle concentration monitor Aug. 18, 1998
5781305 Fiber optic transmissometer Jul. 14, 1998
5757481 Method for testing a turbidity sensor May. 26, 1998

1 2 3 4

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