Abstract:
Disclosed is a low-cost high-resolution compact accelerometer which utilizes multiple self-mixing optical interferometers. The device is also a micro-opto-electro-mechanical systems (MOEMS) sensor. The interferometers are used to detect acceleration as well as monitor the wavelength, temperature, and refractive index and perform differential measurements. In addition, photodetectors are employed to monitor the input optical power.
Abstract:
A thermo-optic system, which may be used for example in thermal imaging, includes an array of optical elements each having a thermally responsive optical property, the optical elements including signal elements and reference elements configured to provide (1) a common-mode response of the optical property to ambient temperature and (2) a differential-mode response of the optical property to a thermal signal appearing across the array of optical elements. The system also includes an optical readout subsystem configured to (1) illuminate the array of optical elements with optical energy at a readout wavelength corresponding to the optical property so as to generate a composite optical signal having common-mode and differential-mode signal components corresponding to the common-mode and differential-mode responses respectively of the signal and reference elements, and (2) filter the composite optical signal to generate a filtered optical signal being substantially the differential-mode image component.
Abstract:
The present invention relates to thermal detectors and the application of such to devices and methods of detecting the infrared images using thermal detectors. For example, by using optical measuring systems in combination with at least one light source to measure changes position of a movable anchored surface coupled to an absorption surface such that the movable anchored surface changes position due to absorption of infrared radiation by the absorption surface. In another example, by combining a detector pixel (infrared radiation sensitive) with an optical measuring device such as an interferometer.
Abstract:
PROBLEM TO BE SOLVED: To provide a temperature control system capable of controlling the temperature of an object to be processed with higher accuracy than prior art.SOLUTION: The temperature control system comprises: a susceptor having a top face on which an object to be processed can be mounted and a passage for a temperature control medium formed inside; temperature measurement means for measuring the temperature of the object to be processed mounted on the top face of the susceptor; first temperature control means for controlling the temperature of the temperature control medium flowing through the passage; and second temperature control means interposed between the susceptor and the first temperature control means and controlling the temperature of the temperature control medium based on the measurement results from the temperature measurement means.
Abstract:
Verfahren zur Temperaturbestimmung einer Probe (21), mit den Schritten Richten eines Sondierlichtstrahls (12, 22, 32) auf die Probe, wobei wenigstens zwei Teilstrahlen des Sondielichtstrahls unterschiedlich lange Wegstrecken in der Probe durchlaufen, indem sie aus wenigstens zwei unterschiedlichen Tiefen in der Probe reflektiert oder rückgestreut werden, Zurückführen der reflektierten oder rückgestreuten Teilstrahlen in eine Analyseeinheit, Erzeugen eines Interferenzmusters in einer Analyseeinheit mittels einer interferometrischen Vorrichtung, welche einen Strahl als Referenzlichtstrahl nutzt, und Auswerten des erzeugten Interferenzmusters in einer Auswerteeinheit, wobei in der Auswerteeinheit die Signalintensität der reflektierten oder rückgestreuten Teilstrahlen gegen die optische Weglänge bestimmt wird und aus der Temperaturverschiebung der Signalintensität die Temperaturverschiebung und die Temperatur der Probe ermittelt wird.
Abstract:
A method and apparatus for measurement of the brightness, flow velocity and temperature of radiant media. A substantially collimated beam (3) of light is directed to a linear polarizer (5) through an interference filter (4). An electro-optically active birefringent crystal (7) separates the linearly polarized output of the polarizer (5) into two characteristic waves and introduces a final phase delay between the wave. The birefringent crystal (7) is electro-optically modulated to introduce a variable phase delay between the characteristic waves. The resultant characteristic waves are combined to interfere and the combination is sampled to produce a signal from which the emission moment of the radiant media can be determined.
Abstract:
The invention concerns a tandem interferometer for temperature sensing. The low coherence interferometry (LCI) system comprises a polarization-based sensing interferometer comprising a birefringent crystal having a sensor temperature sensitivity and a birefringence dispersion, and a readout interferometer being either a Fizeau interferometer using an optical wedge or a polarization interferometer using a birefringent wedge. In one embodiment of the invention, the birefringent crystal has dispersion properties similar to that of the birefringent wedge or that of the optical wedge of the readout interferometer. The present invention also provides a signal processing method for correcting the dispersion effect and for noise filtering in LCI-based optical sensors of the tandem interferometer arrangement.