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:
Jul. 08, 2008
Filed:
Sep. 08, 2003
David J Bryce, Malvern, GB;
Michael Harris, Malvern, GB;
Guy N Pearson, Malvern, GB;
David V Willetts, Malvern, GB;
David J Bryce, Malvern, GB;
Michael Harris, Malvern, GB;
Guy N Pearson, Malvern, GB;
David V Willetts, Malvern, GB;
QinetiQ Limited, London, GB;
Abstract
A coherent differential absorption lidar (DIAL) devicecomprises a transmit portionfor directing a combined light beam to a remote target and a receive portionfor receiving light returned from the remote target and for coherently mixing the received light with its associated local oscillator beam. The combined beam comprises at least two component light beams of discrete wavelengths. The device further comprises a signal correction means. The signal correction means comprising a means for extracting a portion of each component light beam from the transmit portion, a means for introducing a frequency differencebetween each extracted component light beam and its associated local oscillator beam and a means for directing the extracted beam into the receive portion. This provides an additional correction signal thereby improving device performance.