Abstract:
A light measurement device includes a photoelectric converter for receiving light from an object to be measured and converting the light to a measuring electrical energy in accordance with the intensity of the light, an offset amount measurement device for measuring the offset amount of the photoelectric converter, temperature measurement device for measuring a first temperature of the photoelectric converter when measuring the offset amount, and a second temperature of the photoelectric converter when measuring the light from the object, a memory device for storing a characteristic of the photoelectric converter with respect to temperature, correction amount calculation device for calculating a correction amount based on the characteristic, the first temperature, and the second temperature, and a light intensity calculation device for calculating a light intensity based on the measuring electrical energy, the offset amount, and the correction amount.
Abstract:
A near-field goniophotometric apparatus and method for measuring the three-dimensional near-field distribution of luminous flux surrounding a light source. The apparatus incorporates an imaging photometer mounted on a rotatable arm. The photometer is designed to measure the helios of a volume of space rather than the luminance of a planar surface, and to simultaneously measure the helios of a plurality of such volumes. A control mechanism is provided to position the arm and to rotate the light source relative to the arm. The method facilitates prediction of the illuminance or irradiance at a point on a plane from the helios measurements.
Abstract:
A photodetector is provided with a housing that has a discontinuity formed in an outer surface of its light transmissive portion. The discontinuity serves to inhibit liquid droplets from adhering to the outer surface of the endface in the region where the discontinuity is located. Alternative embodiments of the present invention include discontinuities formed in the outer surfaces of housing windows which have flat inner surfaces or inner surfaces which are shaped to formed lenses. By preventing liquid droplets from adhering to the outer surface of the window, the present invention prevents the reflective liquid surfaces of droplets from creating false signals for the photodetector by reflecting light back from the light source toward a light sensitive component.
Abstract:
A system for public display of ultraviolet radiation levels wherein said radiation is collected and measured by one or several optical collectors or sensor assemblies at remote sensing stations. Optical fibers receive and then convey the radiation of the sun through a filter and onto a photovoltaic sensor, measuring the intensity of the ultraviolet radiation. An electrical signal proportional to the ultraviolet radiation is produced with the signal being amplified and either used directly as analog data or converted to a digital signal for the modulation of a radio transceiver. The signal is transmitted to a transceiver of a central data processing station, where it is processed. The processed signal is retransmitted to a receiver in which the processed signal carrier is demodulated and the signal fed to a display station providing the level of exposure to the public.
Abstract:
A photometrical apparatus has a first light receiving element, and a second light receiving element less sensitive to temperature and other environmental influences than said first light receiving element whereby a value Pm of measured quantity of light from the subject is calculated from the following formula ##EQU1## Pr designates a quantity of light from a standard light source, Dr and Dm designate outputs of the first light receiving element generated by the light from the standard light source and the subject, Dpo and Dpt designate outputs of the first light receiving element generated by the light from the reference light source and the subject, and Dso and Dst designate outputs of the second light receiving element generated by the light from the reference light source and the subject.
Abstract:
A light metering system for obtaining a light value by scanning the brightness distribution of the object space within a predetermined field of view. Of the thus-produced brightness signals, those which correspond to a particular target area in the view-field are given respective predetermined weights. The light value is derived on the basis of these weighted signals and the remaining signals.
Abstract:
A slit lamp device having a slit pattern projecting optical system for projecting an illumination light in a pattern of a slit to a patient's eye. An alignment detecting device is provided for detecting the alignment between the optical axis of the projecting system and the axis of the patient's eye. The device comprises one or more light receiving elements such as phototransistors which are located at one or both sides of the projecting optical axis and in the slit plane.
Abstract:
The meter senses flashes of illumination, it converts the illumination to an electrical current whose magnitude is proportional to the intensity of the illumination; it integrates the current over a period of time corresponding to a selected shutter speed by charging a capacitor; it discharges the capacitor and measures the time required to do so; it converts the time required to discharge the capacitor into a corresponding signal representative of an appropriate camera aperture setting for a preselected film sensitivity and shutter speed via a microprocessor and a stored data program; and then displays the camera aperture setting on a multi-segment display. This process is repeated with each new flash of illumination automatically. The meter also measures multiple flashes and displays an accumulated camera aperture setting as well as the number of flashes needed to accumulate that setting.
Abstract:
A semiconductor crystal substrate includes a crystal substrate that is formed of a material including GaSb or InAs, a first buffer layer that is formed on the crystal substrate and formed of a material including GaSb, the first buffer layer having n-type conductivity, and a second buffer layer that is formed on the first buffer layer and formed of a material including GaSb, the second buffer layer having p-type conductivity.
Abstract:
In a radiant heat sensor, first and second thermoelectric members are alternately arrayed one by one in a direction along a first surface of a plate-shaped member so as to be separated from each other, and each of the first and second thermoelectric members configure a portion of the first surface. First conductor patterns extend the first surface, disposed on the first surface so as to span a single first thermoelectric member and a single second thermoelectric member that are adjacent to each other, and configure hot contact portions between the first and second thermoelectric members. Second conductor patterns extend along the first surface, disposed on the first surface so as to span a single first thermoelectric member and a single second thermoelectric member that are adjacent to each other, and configure cold contact portions between the first and second thermoelectric members.