Abstract:
The invention relates to a photodetector arrangement for stray light compensation with a photodetector unit for detecting and determining at least two measuring signals and with a differential unit for subtraction of the measuring signals, wherein between the photodetector unit and the differential unit a compensation unit is provided for compensating the constant components forming the basis of the respective measuring signal.
Abstract:
Bei einer Photodetektor-Anordnung zur Störlichtkompensation ist erfindungsgemäß eine Photodetektoreinheit (2) zur Erfassung und Bestimmung eines Photostroms (I Ph ) mit einer integrierten Kompensationseinheit (6) zur Kompensation von dem Photostrom (I Ph ) zugrunde liegenden Störsignalanteilen (SL) vorgesehen, wobei dem Photostrom (I Ph ) ein die Störsignalanteile (SL) repräsentierendes Kompensationssignal (I HL ) entgegengeschaltet ist.
Abstract:
An apparatus for analyzing light includes an input aperture for receiving light; a first set of one or more lenses configured to relay light from the input aperture; and a prism assembly configured to disperse light from the first set of one or more lenses. The prism assembly includes a plurality of prisms that includes a first prism, a second prism that is distinct from the first prism, and a third prism that is distinct from the first prism and the second prism. The first prism is mechanically coupled with the second prism and the second prism is mechanically coupled with the third prism. The apparatus also includes a second set of one or more lenses configured to focus the dispersed light from the prism assembly; and an array detector configured for converting the light from the second set of one or more lenses to electrical signals.
Abstract:
A material inspection apparatus includes a light source, a light receiver, a light converter, and a processing unit. The light source is configured to emit light to a surface of an object to be inspected. The light receiver is configured to receive light reflected from the surface of the object. The light converter is configured to convert the light received by the light receiver into an electric current. The processing unit is configured to determine, according to the electric current, a material of the surface of the object.
Abstract:
A method of an optical detecting device for synchronizing an exposure timing sequence of an image detector with a light emitting timing sequence of a reference light source is disclosed. The method includes capturing a continued image set according to a predetermined period, analyzing intensity variation of the continued image set, and adjusting the exposure timing sequence of an image detector according to the intensity variation, so as to synchronize the exposure timing sequence of the image detector with the light emitting timing sequence of the reference light source.
Abstract:
Embodiments of the present invention generally describe systems, devices, and methods for directly measuring pulse profiles during pulse delivery. In some embodiment, the pulse profiles may be measured while the pulse is delivered to ablate a material. Embodiments, may calculate ablation spot parameters based on the pulse profiles and may refine one or more subsequent laser pulses based on deviations from the calculated ablation spot parameters from desired ablation spot parameters. In some embodiments, a fluence profiler is provided. The fluence profiler may measure a pulse profile of a laser pulse from a portion of the laser pulse. The fluence profiler may utilize a UV radiation energy sensor device and a camera-based imager. The measurements from the UV radiation energy sensor device and the camera-based imager may be combined and scaled to provide a measured pulse profile that corresponds to the delivered pulse.
Abstract:
An electronic device may have a display with a brightness that is adjusted based on data gathered from one or more ambient light sensors (ALSs). In one suitable arrangement, an ALS may include a photodiode, a temperature sensor, a scaler, an analog-to-digital converter (ADC), and a subtractor. The subtractor may have a first input coupled to the photodiode via the ADC, a second input coupled to the temperature sensor via the scaler, and an output on which a leakage-compensated sensor output is provided. In another suitable arrangement, the ALS may include first and second photodiodes, a light blocking layer formed over the second photodiode, a scaler, and a subtractor. The subtractor may have a first input coupled to the first photodiode, a second input coupled to the second photodiode via the scaler, and an output on which a leakage-compensated sensor output is provided.
Abstract:
The present invention comprises an approach for calibrating the sensitivity to polarization, optics degradation, spectral and stray light response functions of instruments on orbit. The concept is based on using an accurate ground-based laser system, Ground-to-Space Laser Calibration (GSLC), transmitting laser light to instrument on orbit during nighttime substantially clear-sky conditions. To minimize atmospheric contribution to the calibration uncertainty the calibration cycles should be performed in short time intervals, and all required measurements are designed to be relative. The calibration cycles involve ground operations with laser beam polarization and wavelength changes.