Abstract:
The apparatus allows monitoring layer depositions in a process chamber. The apparatus has a light source, a sensor element, and at least one light detector. The sensor element is suitably configured in order to influence the intensity of the light beam measured by the detector by the thickness of the layer growing on the sensor element. The novel monitoring method for measuring the transmitted light intensity utilizes the apparatus. The sensor element has a continuous opening through which the intensity of the light is observed as a function of the opening grown over by the thickness of the growing layer.
Abstract:
Methods and apparatus for compensating a radiation sensor for temperature variations of the sensor. In one example, the radiation sensor is a thermal sensor having at least one property that varies as a function of temperature. The thermal sensor outputs signals based on thermal radiation of interest from a particular radiating body in its view. These signals may contain significant undesirable components due in part to changes in temperature of the sensor itself. Methods and apparatus of the invention compensate the sensor for temperature variations of the sensor that are not due to the radiation of interest, so as to significantly reduce undesirable components in the instantaneous signals output by the sensor. In one example, this is accomplished without thermally stabilizing the sensor itself (i.e., dynamic temperature compensation). In another example, the sensor is thermally stabilized selectively at various predetermined temperatures as a function of the ambient temperature in the proximity of the sensor.
Abstract:
An infrared imaging device combines two sensors, each sensor sensitive to a different spectral range of infrared radiation. Both sensors are combined in a single camera sharing one of three common optical apertures, thus parallax is eliminated between the sensors. Further, a display device is aligned along an optical axis in common with the camera eliminating parallax between the display and camera. Images from the first sensor, the second sensor, or both sensors may be viewed optically and/or electronically. The device is handheld, or mountable on a headgear such as a helmet. When mounted on headgear, the display is viewable by directing the operator's gaze upward, thus the display does not interfere with an operator's straight and downward sight. The image can be sent to a remote display by a wireless transceiver, and waterproof, fireproof, vibration/impact resistance, and hot/cold weather resistance are achieved using a high strength plastic enclosure with foam insert.
Abstract:
The present invention relates to a combustion temperature sensor, and, more particularly, to a combustion temperature sensor that measures infrared energy emitted at several preselected wavelengths from a flame and/or a flame's hot gas at a turbine inlet location and applies the energy signals to a calculation model to yield temperature.
Abstract:
A system and a method for generating three-dimensional image displays with two sensors, in particular two thermal imagers, having two optical channels with fields of view of equal size and with a virtually identical line of sight has at least one image reproduction unit. The optical axes of the sensors are aligned in parallel with one another. The sensors are each provided with a detector for a stereo recording, the stereo recording being performed simultaneously by means of the detectors.
Abstract:
The invention concerns a microbolometer comprising a suspended part (2) containing radiation-sensitive elements and consisting of a set of first zones (2A) and a set of second zones (2B), the two sets being superimposed; furthermore, the materials constituting said zones (2A) and (2B) have thermal expansion coefficients sufficiently different for said suspended part (2) to be deformed under the effect of a rise in temperature to be urged into contact with the substrate (1) when the contact zone reaches a temperature Tc less than the destruction temperature Td of the microbolometer. The invention is applicable to radiation detectors comprising an assembly of such microbolometers, and to various appliances comprising at least such a radiation detector.
Abstract:
Apparatus for determining the temperature profile of the surface being sprayed or otherwise treated, the apparatus comprising four electric arc spray guns (1) spraying molten steel. The guns (1) are connected to a six-axis industrial robot (2) which is adapted to move them over the surface of the ceramic substrate.(3). The metal deposited by the spray builds up a metal shell referred to as the sprayform. The temperature profile of the sprayform surface (3) is recorded periodically by a thermal imaging camera (4) positioned directly above the surface (3). When the field of view of the camera (4) is not obscured by the robot (2), the arc spray guns (1) or their cables (5), the thermal image of the whole sprayform surface (3) can be recorded. However, when the arc spray guns (1), their cables (5) and/or the robot (2) are positioned between the thermal camera (4) and the sprayform surface (3), at least part of sprayform surface (3) is obscured relative to the camera's field of view, with the result that large areas of the resultant thermal image may not be representative of the temperature of the sprayform surface (3). The apparatus includes a pruning filter for receiving each pixel of an image captured by the camera (4) and for applying at least a lower temperature limit to it so as to reject or disregard any pixels determined to have a temperature less than the lower temperature limit. The apparatus may also comprise storage means for storing a master image or array comprising temperature information relating to each of a plurality of pixels intended to be representative of an unobscured image of the surface, and means for updating the master image when the camera (4) captures a new thermal image of the surface by replacing the stored temperature information with updated temperature information obtained from the new thermal image for each of the pixels not rejected or disregarded by the filter means. Alternatively, or in addition, the apparatus may include a Kalman filter or the like which may be used to predict the temperature profile of the surface using the pixels not rejected or disregarded by the pruning filter.
Abstract:
A two-color radiation thermometer includes an image pickup device having micro photo receiving units arranged two-dimensionally; a light diverging device for diverging incident light coming from a measuring object into two paths and irradiating the light on two different areas on a two-dimensional light receiving surface of the image pickup device; a wavelength limitation device for limiting wavelengths of the light irradiated on the two different areas to first and second wavelengths, respectively; and a temperature calculation device. The calculation device receives image signals corresponding to the first and second wavelengths respectively from the micro photo receiving units located at the two different areas, and calculates the temperature of the measuring object based on the two image signals.
Abstract:
A motor vehicle has a video system that analyzes images of the interior of the vehicle to detect certain characteristics for controlling functions of the vehicle, such as detecting the presence of a person on the seat to control deployment of air bags in the event of a crash. The system employs infrared light to illuminate the vehicle interior without affecting the driver's ability to see the highway. In order to distinguish different objects in the image which have similar colors, such as a person dressed in black sitting on a black seat, a selected object, such as the seat, are coated with a substance that alters the object's reflectivity to infrared light, while not changing the reflectivity to visible light. Thus analysis of the infrared image can distinguish between the objects without affecting the appearance of the vehicle interior to a human user.
Abstract:
An apparatus for selectively limiting undesired radiation from a scene is provided. One embodiment includes an optic that is operative to attenuate radiation by selectively losing transparency in response to radiation within a first wavelength band from a source, wherein the loss of transparency affects the passage through the optic of radiation within a second wavelength band from that source. The optic can be positioned between a sensor and the scene such that the sensor is configured to receive radiation from the scene through the optic. Also disclosed is an optical limiter which in one embodiment includes a plurality of such optics, wherein the optical limiter is configured to facilitate transmission of light corresponding to a scene, and wherein each optic is configured to receive a respective portion of the light corresponding to a respective portion of the scene. A light detector assembly and a method of limiting light energy are further disclosed.