Abstract:
A system for measuring radiation in the laboratory or at a site to aid in determining whether to erect a solar energy installation at that site includes a positioner and a sensor. The sensor, which is mounted on the positioner, includes a rotating semispherical chopper and an integrating sphere for collecting radiation in three modes. A broad-band detector measures the irradiance from the integrating sphere to monitor for anomalies. A pair of monochromators simultaneously measure, one in the visible range and the other in the infrared range, the spectral irradiance from the integrating sphere. Processing electronics process the measured spectral irradiance from the monochromators and generate data signals for providing an absolute irradiance spectrum at the plane of the entrance aperture. The absolute irradiance spectrum is inputted to an X-Y plotter and a magnetic disc and tape. The system further includes internal reference sources providing continuous wavelength and irradiance calibration.
Abstract:
A photometer for measuring the light permeability of a material for testing is made portable for hand-held operation outside a laboratory for measurements such as determining the proportion of hemoglobin in human blood. It includes a battery power supply that energizes a lamp, an opening for receiving a cuvet for a measurement, and a measuring circuit having a light-sensitive element. An indicator instrument in the measuring circuit indicates zero compensation, and a manually movable wedge filter is in the path of the light beam for adjusting the light passing through the cuvet. A manually operable element effects a zero compensation of the measuring circuit before a test is made, and a viewable scale on a setting member carrying the wedge filter directly displays a test result value from adjustment of the wedge filter during measurement of the material.
Abstract:
A photometer in which a light beam is split by a mirror into measurement and reference portions, the reference portion of the beam being reflected back through the beam splitting mirror to a photoelectric device. The measurement portion of the beam is reflected back to the beam splitting mirror from which it is reflected to the photoelectric device. The photoelectric device compares intensities of the two received beam portions and provides indication representative of transmission, extinction and remission.
Abstract:
An exposure measuring apparatus has a lighting element which can be connected to and influenced by a source of supply potential. Means are provided for presetting the light emission of the lighting element. A photo-sensitive receiver influenced by prevailing light conditions is connectable with the source of supply potential and influences the light emission of a second lighting element which is connected in circuit with the photosensitive receiver and at least one resistance attenuation element. The resistance attenuation element or elements are adapted to adjust the light emission of the second lighting element in accordance with required exposure factors when the supply potential is connected. The lighting elements are formed as light source pillars the color of which are influenced by their supply frequency, e.g. electro luminescent plates. The source of supply potential is an alternating current source and the second lighting element is connected therewith via a variable frequency generator the frequency of which is influenced by the setting of the resistance attenuation elements. The first and second lighting elements are arranged to illuminate respective surfaces positioned immediately adjacent one another whereby when the color and brightness of each of the surfaces is equal, the exposure factors are set to values required for accurate exposure.
Abstract:
A RATIO METR FOR GIVING THE LOG OF THE RATIO OF TWO VOLTAGES. AN RC CIRCUIT IS CHARGED AND ALLOWED TO EXPONENTIALLY DISCHARGE. COMPARATOR MEANS RECEIVE THE TWO VOLTAGES AND THE VOLTAGE OF THE RC CIRCUIT AND PROVIDE OUT PUT SIGNALS WHEN EACH OF THE TWO VOLTAGES IS EQUAL TO THE VOLTAGE OF THE RC CIRCUIT. THE TIME LAPSE BETWEEN SAID TWO SIGNALS CORRESPONDS TO THE LOG OF THE RATIO OF THE TWO VOLTAGES.
Abstract:
A spectrophotometer of the double-beam null type having a reference beam passing through a reference cell and a sample beam passing through a sample cell and means for adjusting the relative attenuation of the two beams which is operable over two ranges of measurement. Two attenuators are provided, one in each beam, the two attenuators giving different ranges of attenuation. The two attenuators can be operated together, one increasing attenuation as the other decreases it, so that a maximum range of relative attenuation is obtained or one attenuator is operated alone. The attenuators are mechanically movable attenuating elements which can be electrically locked together and control means are provided which automatically bring the two together and lock them when both are to be used or automatically move one to a datum position and locks it there when only the other is to be used.
Abstract:
A light contrast meter successively exposable to different light intensities provides a visual indication of the light intensity extremes or the difference between the light intensity extreme and the immediate incident light. In one form a capacitor is charged through a diode to a voltage corresponding to maximum incident light and is connected in series with an impedance the voltage across which varies with the incident light and a meter measures the difference of this voltage and that across the capacitor. In another form a pair of photoconductors are connected in series with respective resistors one capacitor being connected through a diode across the first resistor and another capacitor being connected through a diode across the second photoconductor and meters measure the capacitor voltages.
Abstract:
This automatic analysis apparatus is provided with: an analysis port comprising a reaction container holding part that holds a reaction container storing the liquid mixture of a sample and a reagent, a light source that emits light to the liquid mixture stored in the reaction container held by the reaction container holding part, and a detector that detects light generated when the light from the light source is emitted to the liquid mixture; and a control unit that controls the analysis port, and analyzes the sample on the basis of information about the detected light. The automatic analysis apparatus is characterized in that: the surface of an inner wall of the reaction container holding part is configured to reflect at least a portion of the light emitted from the light source; and the control unit executes control so as to emit the light from the light source in a state where the reaction container is not held by the reaction container holding part, to detect the light reflected on the surface of the inner wall of the reaction container holding part by the detector, and to not use the analysis port for analysis when the result of the detection shows that the detected light is less than a first value determined in advance.
Abstract:
A method of distinguishing effective pulses from test pulses in a scintillation detector that generates measurement light pulses includes providing a regularly-pulsed test light source that produces individual test light pulses having a time-dependent course of relative light intensity, which differs from a time-dependent course of relative light intensity of the measurement light pulses. The test light pulses are provided to a light detector for measurement of the test light pulses. The time-dependent courses of the relative light intensities of the test light pulses are analyzed. The measured pulses are separated into the test light pulses and the measurement light pulses according to the different time-dependent courses of the relative light intensities. The detector includes a scintillator, a light detector, a regularly-pulsed test light source that is adapted provide test light pulses to the light detector for measurement, and an electronic measuring circuit.