Results 241 to 250 of about 208,412 (295)

Phase Compensation for Thermal Blooming

Applied Optics, 1973
Appropriate correction of the initial phase of a laser beam is shown by numerical computation to be capable of appreciably reducing thermal blooming for a cw beam.
L C, Bradley, J, Herrmann
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Drift compensation in thermal anemometry

Measurement Science and Technology, 2020
Abstract The drift of the resistance of sensors used in thermal (such as hot-wire and hot-film) anemometry remains a perpetual concern for users of constant-temperature anemometers (CTAs). Even small changes in the resistance of such sensors result in error if the sensor was calibrated prior to the occurrence of ...
Alaïs Hewes, James I Medvescek, Laurent Mydlarski, B Rabi Baliga   +3 more
openaire   +1 more source

A thermally compensated microbarograph

Journal of Physics E: Scientific Instruments, 1982
Microbarographs are made virtually temperature independent by procedures including installation of a temperature-dependent compensating electronic system.
G L Goodwin, C R Flaherty
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Thermal drift compensation method for microbolometer thermal cameras

Applied Optics, 2012
We propose a new method of compensation for drifts in thermal cameras using a filter in place of a shutter. The latter method requires periodically closing the camera, thus causing the images to appear frozen frequently. Our technique of replacing the shutter with a filter eliminates this frozen image problem. In this paper we discuss the principles of
Robert, Olbrycht, Bogusław, Więcek, Gilbert, De Mey   +2 more
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Apparatus and its principle for thermal aberration compensation

Applied Optics, 2022
Thermal aberrations caused by absorption of laser beams degrade the image quality of exposure tools during the working process. Many compensators, such as lens movement or lens deformation, are used to compensate for low-order thermal aberrations of optical systems.
Xinfeng, Yu, Huaijiang, Yang, Mingyang, Ni   +2 more
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Thermal effects and thermal compensation in the OSIRIS camera

SPIE Proceedings, 2003
Tight stability requirements for the imager/spectrograph OSIRIS (a Day One optical instrument for the GTC telescope) demand a careful treatment of thermal effects within the OSIRIS camera. Mostly due to the thermal response of refraction indices of its glasses (and not so much to curvature, spacing or thickness variations of the lenses), the camera ...
J. Jesus Gonzalez, Carlos Tejada, Alejandro Farah, Jose L. Rasilla, F. Javier Fuentes   +4 more
openaire   +1 more source

Thermal Compensation Method for Piezoresistive Pressure Transducer

IEEE Transactions on Instrumentation and Measurement, 2021
Piezoresistive pressure sensors are employed in a wide range of applications, but their output signal shows a substantial dependence on the working temperature. Usually, there is a need for an additional component to ensure a proper temperature-compensated signal for the sensors. In this article, we describe a method for the sensor thermal compensation
Ricardo dos Santos Pereira, Carlos Alberto Cima   +1 more
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Image compensation in the presence of thermal blooming

Applied Optics, 1983
The effect of image compensation in viewing extended targets through thermal blooming is discussed. A wave-optics propagation code simulating multiple point sources and a low-bandwidth return-wave adaptive optics system is used to determine the steady-state thermally induced phase distortions and wave-front correction through various Zernike modes ...
openaire   +2 more sources