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Thermoreflectance temperature measurement with millimeter wave.
Rev Sci Instrum
June 2014
I2M (Institut de Mécanique et d'Ingénierie de Bordeaux) UMR CNRS 5295, TREFLE Department, Esplanade des Arts et Métiers, F-33405 Talence Cedex, France.
GigaHertz (GHz) thermoreflectance technique is developed to measure the transient temperature of metal and semiconductor materials located behind an opaque surface. The principle is based on the synchronous detection, using a commercial THz pyrometer, of a modulated millimeter wave (at 110 GHz) reflected by the sample hidden behind a shield layer. Measurements were performed on aluminum, copper, and silicon bulks hidden by a 5 cm thick Teflon plate.
View Article and Find Full Text PDFWe present a new method of formation photoplethysmographic images with high spatial resolution from video recordings of a living body in the reflection geometry. The method (patent pending) is based on lock-in amplification of every pixel of the recorded video frames. A reference function required for synchronous detection of cardiovascular pulse waves is formed from the same frames.
View Article and Find Full Text PDF[Hyperspectral of the body surface tissues: a new synchronous detection technology of the compositional information and structural information].
Guang Pu Xue Yu Guang Pu Fen Xi
January 2011
State Key Laboratory of Precision Measurement Technology and Instruments, Tianjin University, Tianjin 300072, China.
The present paper innovatively proposed the technology using hyperspectral to detect the body surface tissues that can achieve the systemic analysis of composition and structure by obtaining the multiple spectrum and image information simultaneously. Besides, by the method of data mining, the relationships between diseases and the data including the spectrum, image or synentropy were established. This technology provided more information for the disease detection clinically which can reflect accurately the physiological, biochemical and pathological status and the variation of the body surface tissues, by which both the cost of the equipment and the operation steps can be reduced.
View Article and Find Full Text PDFSingle actuator alignment control for improved frequency stability of a cavity-based optical frequency reference.
Appl Opt
March 2008
Frequency Standards and Metrology Group, School of Physics, University of Western Australia, 35 Stirling Highway, Nedlands 6009 WA, Australia.
We demonstrate a method of controlling the alignment of a laser beam to a Fabry-Perot resonator through synchronous detection of the misalignment arising from modulating the orientation of a single beam-steering mirror. The horizontal and vertical tilt of the mirror are modulated in quadrature to drive a circular motion of the beam orientation. A corresponding modulation of the intensity of the optical field circulating in the cavity is measured at either the reflected or transmitted port and demodulated synchronously to derive two error signals to indicate the vertical and horizontal misalignment.
View Article and Find Full Text PDFLaptop photothermal reflectance measurement instrument assembled with optical fiber components.
Rev Sci Instrum
May 2007
Department of Electronics, Information, and Communication Engineering, Faculty of Engineering, Osaka Sangyo University, 3-1-1 Nakagaito, Daito, Osaka 574-8530, Japan.
In this article, we propose a laptop photothermal reflectance measurement instrument assembled with optical fiber components. The primary feature of this instrument is that all of the optical routes for the pumping and probing beams, as well as the beam sources using a laser diode, are composed of optical fiber and optical fiber components. With this configuration, the problems related to the technical shortcomings of the conventional instrument can be solved completely.
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