Abstract:
An optical spectrometer contains a photodiode and a straining mechanism for imposing adjustable strain on the photodiode. The spectrometer includes a measurement apparatus for measuring variation of photocurrent with strain at different values of the adjustable strain imposed by the straining mechanism. Adjusting the strain allows adjustment of the band gap Eg of the photosensitive region of the photodiode, and this determines the cut-off energy for absorption of photons. Measuring variation of photocurrent with strain at different values of the adjustable strain imposed by the straining mechanism allows study of photons within a desired energy range of the band gap energy corresponding to each strain value.
Abstract:
An optical sensing device for using light to locate objects or features in a field of view comprises a light source; a controllable lens having two states and being controllable between them, for example a multifocal lens having two or more foci for focusing light from the light source; and a sensor able to sense light reflected from an object, to determine information of the object. The use of two or more foci adds dynamic range to optical sensing to allow for reliable detection over a wide range of distances.
Abstract:
An analyzer of the spatial intensity distribution of a laser beam focused or transmitted by an optical fiber comprises: a shaping lens; a device for taking a partial sample of the beam; a heat sink; a photodiode; an imaging lens to form images of the plane on an image sensor; a motorization of the shaping lens to translate along the optical axis; a motorization of the imaging lens to translate in a plane perpendicular to the optical axis; a motorization of the image sensor to translate along the optical axis; an electronic unit controlling each motorization; an electronic unit synchronizing the image sensor, connected to the photodiode to synchronize image capture with the laser pulses or in the pulses; an electronic unit adjusting the aperture and/or gain of the image sensor; and a software interface parameterizing and piloting the electronic control units, equipped with an image processing unit.
Abstract:
An automatically adjustable method for use in opto-acoustic metrology or other types of metrology operations is described. The method includes modifying the operation of a metrology system that uses a PSD style sensor arrangement. The method may be used to quickly adjust the operation of a metrology system to ensure that the data obtained therefrom are of the desired quality. Further, the method is useful in searching for and optimizing data that is or can be correlated to substrate or sample features or characteristics that of interest. Apparatus and computer readable media are also described.
Abstract:
An occupancy sensor with a separable override unit can selectively override the operation of the occupancy sensor at designated times and for selected time intervals. The occupancy sensor includes a light sensor to actuate the occupancy sensor and a light assembly when the ambient light is below a predetermined level and to deactivate the occupancy sensor when the ambient light is above a threshold level. The override unit is provided with a light source, such as an LED, to emit light to actuate the light sensor of the occupancy sensor, thereby controlling the occupancy sensor, such as by preventing the occupancy sensor from being actuated. The occupancy sensor includes a cavity for receiving the override unit with the LED aligned with the light sensor: A control unit is operatively connected to one or more override units for selectively controlling the normal operation of the occupancy sensor.
Abstract:
An apparatus adapted for confocal imaging of a non-flat specimen comprising a coherent light source for producing a light beam, imaging optics adapted to focus the light beam into at least one spot on a surface of a specimen, and a detector adapted to receive and detect light reflected from the specimen surface. The imaging optics comprise at least one optical component located so that the light reflected from the specimen surface passes therethrough on its way to the detector. The optical component is movable so as to move the at least one spot, within a range of movement, to a number of distinct locations in a plane perpendicular to the apparatus' optical axis, within the detector's integration time.
Abstract:
An occupancy sensor is provided with a separable override unit to selectively override the operation of the occupancy sensor at designated times and for selected time intervals. The occupancy sensor includes a light sensor for actuating the occupancy sensor and a light assembly when the ambient light is below a predetermined level and to deactivate the occupancy sensor when the ambient light is above a threshold level. The override unit having a light source is removably attached to the occupancy sensor. The override unit is coupled to the occupancy sensor to emit light to actuate the light sensor of the occupancy sensor, thereby preventing the occupancy sensor from being actuated regardless of the light level in the surrounding areas. A control unit is operatively connected to one or more override units for selectively controlling the normal operation of the occupancy sensor.
Abstract:
An optical sensing module is adapted to be assembled to a frame of a display device. The display device comprises a display module and the frame, and the display module has a display area and the frame surrounds the display area. The optical sensing module comprises a casing and an optical sensor. The casing is pivoted to the frame and the optical sensor is configured in the casing for sensing external light projecting on a side of the casing. The optical sensor is capable of sensing a brightness of the display area when the side of the casing faces the display area and sensing a brightness of an ambient light when the side of the casing doesn't face the display area.
Abstract:
An apparatus adapted for confocal imaging of a non-flat specimen comprising a coherent light source for producing a light beam, imaging optics adapted to focus the light beam into at least one spot on a surface of a specimen, and a detector adapted to receive and detect light reflected from the specimen surface. The imaging optics comprise at least one optical component located so that the light reflected from the specimen surface passes therethrough on its way to the detector. The optical component is movable so as to move the at least one spot, within a range of movement, to a number of distinct locations in a plane perpendicular to the apparatus' optical axis, within the detector's integration time.
Abstract:
Proposed is a light sensor (1), comprising at least one wavelength selective photo-detector (10), a lens (20) and an aperture (30).The wavelength selective photo-detector allows detecting light within a predefined wavelength range falling on the sensor. The lens project light on the photo-detector and the aperture defines a field of view of the light sensor. The photo-detector (10), the lens (20), and the aperture (30) are arranged in a telecentric configuration. Advantageously, this allows light to impinge on the wavelength selective photo-detector within a predefined range of angles irrespective of the direction of the light incident on the aperture, thus removing the angle dependent response of the wavelength selective photo-detector.