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Caesar T. Garcia, Ahmad Shoeibi, Marin Sandu, A. Guglielmetti
Summary The study area is located at Block #26 within the Salinas Basin, specifically in Deep Water at the southeastern Gulf of Mexico, where geological complexities in the Upper Eocene formations were observed. In this stage, the region has a distinctive geological …
Allan Hilton, Samuel J. Wyman, Caesar T. Garcia, Robert Stewart et autres
Shortwave infrared (SWIR) sensors are a key component of modern-day laser designation and surveillance systems; allowing the warfighter to covertly acquire and target adversaries with common infrared laser wavelengths including 1064nm and 1550nm. SWIR Vision Systems builds high-resolution sensors using colloidal quantum …
Caesar T. Garcia, Guclu Onaran, Brad Avenson, Neal A. Hall
The Department of Energy (DOE) and the National Nuclear Security Administration (NNSA) seek revolutionary sensing innovations for the monitoring of nuclear detonations. Performance specifications are to be consistent with those obtainable by only an elite few products available today, but with orders …
Donghwan Kim, Caesar T. Garcia, Brad Avenson, Neal A. Hall
Optical grating-based interferometric sensors have been the subject of prior investigations, with recent work focused on micromachined microphone applications. The silicon structure is similar in construction to capacitive microelectromechanical-system microphones, with the exception that the microphone backplate contains an optical-diffraction grating at …
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A. Guclu Onaran, Caesar T. Garcia, Alex X. Liu, Matt Christensen et autres
Most surface mount microelectromechanical system (MEMS) microphone packages are similar in construction, consisting of a printed circuit board with sound inlet, a MEMS die with a through-wafer etch aligned over the sound inlet, and cap which serves to protect the structure and …
Michael L. Kuntzman, Caesar T. Garcia, A. Guclu Onaran, Brad Avenson et autres
A microelectromechanical systems (MEMS) optical microphone that measures the interference of light resulting from its passage through a diffraction grating and reflection from a vibrating diaphragm is described ( JASA, v. 122, no. 4, 2007). In the present embodiment, both the diffractive …
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Michael L. Kuntzman, Karen D. Kirk, Caesar T. Garcia, Guclu A. Onaran et autres
A microelectromechanical systems (MEMS) optical microphone has been presented that measures the interference of light resulting from its passage through a diffraction grating and reflection from a vibrating diaphragm. [J. Acoust. Soc. Am. 122, (2007).] In this embodiment, both the diffractive optical …
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Baris Bicen, Kamran Jeelani, Caesar T. Garcia, Neal A. Hall et autres
In this paper, integration and packaging of directional biomimetic microphones using a diffraction-based optical displacement detection method is described. The optical detection method senses the displacement of the microphone diaphragm by monitoring the change in the intensity of a diffracted laser beam. …
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Ronald N. Miles, Qingyang Su, Wei Cui, Mihir Shetye et autres
A miniature differential microphone is described having a low-noise floor. The sensitivity of a differential microphone suffers as the distance between the two pressure sensing locations decreases, resulting in an increase in the input sound pressure-referred noise floor. In the microphone described …
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Baris Bicen, Caesar T. Garcia, Neal A. Hall, Murat Okandan et autres
Diffraction-based optical displacement detection method and its use in low noise micromachined microphones have been shown earlier. [Hall et al., J. Acoust. Soc. Am. 118, 3000-3009 (2005), Garcia et al., J. Acoust. Soc. Am. 121, 3155 (2007)]. In these devices, the integrated …
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Ronald N. Miles, Quang T. Su, Weili Cui, Stephen A. Jones et autres
A miniature differential microphone is described that has a noise floor that is substantially lower than that of existing devices of comparable size. The sensitivity of a differential microphone suffers as the distance between the two pressure sensing locations decreases, resulting in …
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Neal A. Hall, Murat Okandan, Robert Littrell, Darwin K. Serkland et autres
A micromachined accelerometer device structure with diffraction-based optical detection and integrated electrostatic actuation is introduced. The sensor consists of a bulk silicon proof mass electrode that moves vertically with respect to a rigid diffraction grating backplate electrode to provide interferometric detection resolution …
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