Abstract:
The invented apparatus can be used to monitor the radiant energy delivered to a substrate for treatment thereof. The radiant energy can be laser light or light generated by a flash-lamp, for example. The apparatus includes an energy-tapping member such as a beam splitter, that is positioned between a source and optical element(s) used to generate and modify radiant energy, and a substrate to be treated with the radiant energy. The energy-tapping member receives radiant energy from the source and optical element(s), and divides the radiant energy from the source and optical element(s) into two portions. The first portion of radiant energy travels from the energy-tapping member to the substrate for treatment thereof. The apparatus includes an energy sensor such as a photodiode, arranged to receive the second portion of radiant energy. The energy sensor generates a signal indicative of the radiant energy supplied to the substrate. The energy-tapping member is preferably positioned optically downstream from the optical element(s) as the last or near last element encountered by the radiant energy. As so positioned, thermal or mechanical drifts in the optical element(s) have little or no impact on the ability of the invented apparatus to determine the amount of radiant energy supplied to the substrate. The apparatus can include a processing unit coupled to receive the sensor signal, which integrates the sensor signal to generate a signal indicative of the amount of radiant energy supplied to the substrate. The processing unit can also generate a visual display of the amount of radiant energy supplied to the substrate. The invention also includes related methods.
Abstract:
A plurality of systems and methods for generating reproducible illumination by adjusting solid-state devices regulated by a control system that illuminate sample parts in a compensated, standardized manner. An illumination system includes an illumination source directed onto the optical axis of a light collection system. The light collection system includes a collection lens assembly and at least one CCD detector. The lens assembly and CCD detector perform the spatial imaging of the sample part. An optical element positioned between the illumination source and the sample part redirects a portion of the entire energy emitted from the illumination source to a monitoring detector. The monitoring detector measures the optical power illuminating the sample part and compares it to a previously measured reference illumination source level. Based on the results of the comparison and additional input from temperature, color and other sensor, the drive current to the illuminating source is adjusted to consistently illuminate the sample part within an instrument model line and over an extended time period.
Abstract:
An automatic intensity control unit for use in a moisture sensor which senses moisture on the surface of a transparent material. The moisture sensor includes one or more emitters for producing an emitter signal which is influenced by moisture on the transparent material, and one or more detectors for receiving the emitter signals. The automatic intensity control unit adjusts the intensity of the emitter signals to accommodate transparent materials having different transmittances. The automatic intensity control unit includes a comparator for comparing the intensity the emitter signals received by the detectors with a predetermined reference signal and a counter communicating with the comparator for producing a counter output. The automatic intensity control unit also includes an emitter driver for providing power to the emitters in an amount which determines the intensity of the emitter signals, and an emitter intensity control signal generator communicating with the counter and the emitter driver for controlling the intensity of the emitter signals.
Abstract:
Micro-electromechanical apparatus and method with position sensor compensation to compensate for sensor drift. A preferred embodiment comprises modifying the intensity of a light source used in position detection to maintain a constant sum of the voltages output from photodetectors receiving light from the light source. Preferred embodiments may be implemented in digital signal processor code, or external to the processor in analog circuitry. By adjusting light source intensity, position calculations may be performed without normalization, and thus without a time-consuming division operation.
Abstract:
Optical detector with pulsed emission, particularly of the background suppression cell type, with means for rapid regulation of the emission current. When the voltage signal received V is located outside a regulation interval Z1, the emission current is multiplied or divided by a predetermined factor to bring the signal V rapidly within the interval Z1; when the signal V is within the interval Z1, the emission current is regulated by control means to attain a value corresponding to the adjustment of the signal V to a required value Vopt.
Abstract:
An arrangement for illuminating a specimen field in an optical instrument for specimen viewing includes: an illumination device, arranged in a housing, including a light source and an illuminating optical system, where a position of the light source or illuminating optical system is adjustable within the illumination device; a setting device including at least one drive system and configured to positionally adjust the light source or illuminating optical system; at least one linkage member connected to the light source or illuminating optical system, where the linkage member includes a coupling member accessible by the setting device from outside the housing; at least one measurement device configured to sense parameters of the light generated by the illumination device; and a control device that is configured to generate positioning commands for positional adjustment of the light source or illuminating optical system by the drive system as a function of the sensed parameters.
Abstract:
The present invention provides a display device with feedback brightness sensing, suitable for using in a PDA, that comprises a LCD panel at an outside of which is installed a first photo-sensor for sensing a light brightness variation of its environment. A corresponding sensing signal is delivered to a first converter to be converted to a first digital reference signal that is delivered to a microprocessor for determining a brightness increase or decrease of the display panel. Via a light-guiding element and a second photo-sensor installed within the display panel, the light brightness from the display panel is sensed and converted to a second digital reference signal that is compared with the first digital reference signal to determine whether the display brightness is at an optimal value. An automatic brightness adjustment of the display device is thereby achieved to reduce power consumption and protect the user's eyes.
Abstract:
A brightness feedback display device includes a LCD panel, a plurality of first photo-sensors for sensing the environmental brightness variation of the display device itself. Corresponding sensing signals are delivered to first converters for being converted to first digital reference signals that are delivered to a microprocessor, thereby determining how much brightness of the display panel increases or decreases. Via a light-guiding element and a second photo-sensor installed within the display panel, the light brightness from the display panel is sensed and converted to a second digital reference signal that is compared with the first digital reference signals to determine whether the display brightness is at an optimal value.
Abstract:
A vehicular rearview mirror system and method of controlling the vehicle rearview mirror system including establishing a most-dimmed reflectance level of the interior mirror reflective element that is higher than a most-dimmed reflectance level of the exterior mirror reflectance level, the establishment being a function of the rear window light transmission value. The establishment may be a function of sampling of light sensed by at least one light sensor in the passenger compartment that is directed toward the rear-viewing rear window to receive light passing through the rearward-viewing rear window.
Abstract:
In a scanning optical device having an APC (automatic power control) circuit for controlling an output power of a laser diode, a reference value is determined by sampling saw-tooth wave which varies time elapses. A triggering system is provided to output a trigger signal, and the saw-tooth wave is sampled and held in response to the trigger signal. Based on the sampled and held value, i.e., the reference value and a value corresponding to the output power of the laser diode, an APC operation is performed.