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:
Dec. 21, 2010
Filed:
Sep. 06, 2006
Masafumi Ito, Osaka, JP;
Norihiko Nishizawa, Nagoya, JP;
Masaru Hori, Nagoya, JP;
Toshio Goto, Nisshin, JP;
Hiroyuki Kano, Aichi, JP;
Masafumi Ito, Osaka, JP;
Norihiko Nishizawa, Nagoya, JP;
Masaru Hori, Nagoya, JP;
Toshio Goto, Nisshin, JP;
Hiroyuki Kano, Aichi, JP;
NU Eco Engineering Co., Ltd., Nishikamo-gun, Aichi, JP;
Abstract
To achieve an apparatus capable of measuring a light absorption coefficient f a sample with high sensitivity. A ring down spectroscope uses a wavelength-variable femtosecond soliton pulse light source. Pulse light is input to a loop optical fiberthrough a first light waveguideand a wavelength selective switch. Ring down pulse light is input to a homodyne detector through the wavelength selective switch. On the other hand, pulse light propagating in the first light waveguideis split and input to light waveguides constituting a second light waveguidethrough an optical directional couplerand a first optical switching element. The pulse light propagating in the second light waveguideis input to the homodyne detector as reference light and used for synchronous detection. The plural light waveguides constituting the second light waveguidediffer in optical length in accordance with the length of the optical fiber, and can slightly change the optical length.