Abstract:
1396806 Atomic fluorescence spectrometer UNISEARCH Ltd 30 July 1973 [4 Aug 1972] 36091/73 Heading G1A An atomic fluorescence spectrometer comprises a light source 1, chopper 2, a dual channel detection system, both channels receiving radiation from a burner or non-flame cell containing the test vapour, each channel including a monochromator or filter 6, photo-multiplier 7, amplifier 8, voltage to frequency converter 9 and counter-timer 10, are channel det' ting signals at the wavelength at which the vapour fluoresces, the other channel detecting signals at a wavelength at which the sample light is intense but at which there is no fluorescence. Noise due to thermal emission, chemiluminescenee and background emission is eliminated by synchronous demodulation from the chopper via stop-start control 11. Rayleigh scattering B eliminated by subtracting the demodulated output signal from the non-fluorescent channel from that provided by the fluorescent channel to yield the signal due to fluorescence alone. The chopper runs at 4 Hertz. The counter is set to integrate the pulses over specified time periods wholly contained within successive light-on periods or with successive light-off periods.
Abstract:
Apparatus for emission spectrochemical analysis wherein the sample to be analyzed is excited by repeated spark discharge to emit light, which is dispersed to produce a spectrum containing emission lines characteristic of the elements in the sample. The intensity or quantity of light of each of the emission lines of the elements to be determined and that of the corresponding one of the emission lines selected as the internal standards for the elements to be determined are measured each time a spark discharge is produced to obtain the ratio of the former intensity or quantity to the latter at each spark discharge, and the ratios resulting from a predetermined number of spark discharges are averaged for each of the elements to be determined. From the average the content of each of the elements is read on a calibration curve.
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.
Abstract:
A hand-held, battery powered instrument for the determination and recording of the intensity of radiation emitted or reflected by a target in the field in spectral bands from 400 nm to 12 micrometers. Two fields of view, typically 20 DEG and 1 DEG , are provided. The pointing accuracy is 0.1 DEG or better. Multiple detectors are controlled by a single shutter. Gain and zero controls are preset, the whole spectral band is sampled in 4 seconds, and the results stored. They are later called up and shown on a liquid crystal display digitized to 9999.