Abstract:
A spectrometer readout system with storage capacitors for temporarily storing output signals generated by a series of photomultiplier tubes that are positioned to monitor selected spectral lines. A voltage-time converter sequentially discharges the capacitors to a preset level and converts the stored voltages into signals that are related logarithmically to a known signal and an unknown signal. The output of the voltage-time converter defines the log discharge time period which is measured and stored by a computer.
Abstract:
A spectrometric system for multielement analysis and a cassette for use in such system, the cassette having a plurality of aligned and nonaligned channels therethrough, each of which has an inlet and an outlet, the inlets in the focal plane of the spectrometer, and each outlet adjacent a photomultiplier tube, and optical transmission means within the cassette to transmit spectral emission radiation received by the nonaligned inlets through channels to the photomultiplier tubes adjacent the nonaligned outlets for such channels.
Abstract:
A method of simultaneously locating and identifying a plurality of materials within a field of view by comparing the spectral characteristics obtained from systematically scanning the field of view with known spectral signatures of the same materials stored in a memory bank. The number of times a known material is identified as being in the field of view is recorded and referenced to a base. The spectral signatures in the memory bank are continually updated in response to spectral conditions obtained from scanning the field of view.
Abstract:
There is provided a photodetector wherein charging current to a photodiode is integrated to determine an amount of discharge due to conduction of photoelectric current through the photodiode and thereby to measure intensity of photon flux incident to the photodiode, so that linearity of light input intensity versus output voltage characteristics can be improved and dynamic range of the measurement can be extended.
Abstract:
An arrangement of the Rowland character includes a support and a concave grating on the support for producing the spectrum characteristic of a sample being investigated. The support has a series of slits thereon which are positioned on the Rowland circle and are adjusted to the spectral lines of samples to be investigated. An element on the support is provided with a primary slit for directing the radiation derived from a sample being investigated onto the concave grating. The primary slit is positioned on the Rowland circle and the element provided with the primary slit is mounted on the support for movement along the arc of the Rowland circle. The element is mounted in such a manner as to be arrestable in a plurality of positions. The element is favorably in the form of a plate. A preferred embodiment contemplates the provision of a pair of grooves in the support, which latter may be in the form of a housing, with the grooves following the curvature of the Rowland circle and the element being guided in the grooves. The edges of the element located in the grooves may be provided with openings in which there are accommodated spherical members as well as biasing elements for urging the spherical members into contact with the grooves.
Abstract:
The colors or surface conditions of small articles are determined by passing the articles through an integrating sphere and separately illuminating the articles before they enter the sphere, during their passage through the sphere and after they leave the sphere. The light transmitted through or reflected by each article is collected by the sphere and passed to analyzing apparatus. The articles are sorted according to the measurements.
Abstract:
To provide for more reliable determination of resistance of sample surfaces to light and weather influences, test apparatus is equipped with a radiation-measuring device. A portion of radiation used for testing is guided to the measuring device, by quartz guides, spectrally dispersed, and measured as to intensity and/or dosage in one or several pre-selected spectral regions. Tests may use natural or artificial radiation, and a measuring device may be stationary or movable relative to a radiation source.
Abstract:
This specification discloses a spectrophotometer utilizing, as the photoelectrical converting element, an image sensor capable of electrical scanning such as a photo-diode array, thus adjusting the integration time thereof, namely, the scanning time of the image sensor and enhancing the S/N (signal-to-noise ratio).
Abstract translation:本说明书公开了一种使用光电转换元件作为光电二极管阵列等能够进行电扫描的图像传感器的分光光度计,由此调整其积分时间,即图像传感器的扫描时间,提高S / N (信噪比)。
Abstract:
An apparatus for measuring the moisture content of a soil sample at selected depths is disclosed. Light is conducted from a source via a fiber optical cable to a soil probe which is inserted at selected depths into a bore hole formed in the soil sample. Light from the source and reflected light from the soil sample is conducted via fiber optic cables to a reflectometer, which determines reflection factors of the soil sample at three selected infrared wavelengths of a water absorption band. Means are provided to compute the moisture content of the sample at the selected depths from the measured reflectance factors.
Abstract:
An electro-optical detector array and spectrum analyzer system consisting of a novel detector array containing a plurality of photodetectors, each covered by a different narrow band optical filter and each activated when an electromagnetic energy source admitted by the narrow band optical filter is present whereby discrete components of the electromagnetic energy can be identified simultaneously and nearly instantaneously by comparison with the known wavelength admittance characteristics of said narrow band optical filter. Companion electronics and associated metering equipment complete the system.