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:
Feb. 15, 2011
Filed:
Aug. 31, 2007
Robert E. Uber, Pittsburgh, PA (US);
Robert E. Uber, Pittsburgh, PA (US);
Mine Safety Appliances Company, Pittsburgh, PA (US);
Abstract
A photoacoustic sensor includes a sensor system for photoacoustic detection, at least one noise canceling pressure sensor and a control system in operative connection with the noise canceling pressure sensor to actively cancel the effects of noise in the environment on the sensor system. Another photoacoustic sensor includes a measurement volume, a source of light energy, a photoacoustic pressure sensor, and at least one vibration canceling sensor (for example, a microphone or an accelerometer). A further photoacoustic sensor includes a measurement volume, a source of light energy and a photoacoustic pressure sensor. The measurement volume has an inner surface that is continuously curved over substantially the entire inner surface other than where a window in optical connection with the source of light intersects the measurement volume.