The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 31, 1999
Filed:
Aug. 19, 1998
Richard K DeFreez, Azalea, OR (US);
Valey F Kamalov, Medford, OR (US);
Met One, Inc., Grants Pass, OR (US);
Abstract
A particle detector (10, 12, 70) employs an upconversion laser medium (22, 72) to produce emission radiation (32) at an emission wavelength (56) that is less than the wavelength of the pumping radiation (26). The shorter emission wavelength (56) provides a significant increase in the scattering intensity (I.sub.sc) detected by the particle detector (10, 12, 70), based on the equation I.sub.sc =I.sub.o k/.lambda..sup.4, where I.sub.o represents the intensity of emission radiation (32), .lambda. represents the wavelength (56) of the emission radiation (32), and k represents a coefficient related to particle size. In addition, the emission wavelength (56) of the upconversion laser medium (22, 72) can be frequency doubled to excite biological chromophores such as tryptophan, NADH, and flavin compounds that absorb in the UV spectral range and emit fluorescence at longer wavelengths that can be discretely detected to determine the presence of biological particles.