Abstract:
A wavelength-variable light source emits to a measurement object light having its wavelength continuously changed from predetermined start wavelength to stop wavelength. A timing information output unit generates a plurality of elements of timing information indicating the output timings of lights respectively having a start wavelength, a stop wavelength and a plurality of wavelengths obtained by dividing the interval between the start and step wavelengths by specified steps. A light receiving unit receives light from the measurement object and outputs a signal representing the measurement value of the received light. A plurality of amplifiers receive a signal from the light receiving unit and amplify the signal at respective specified amplification ratios. A signal selection unit selects one signal within a specified measuring range out of signals amplified at respective amplification ratios by the amplifiers and outputs it as a measurement value by light having a wavelength defined by applicable timing information in the plurality of elements of timing information from the timing information output unit.
Abstract:
Encoded spatio-spectral information processing is performed using a system having a radiation source (12), wavelength dispersion device (16) and two-dimensional switching array (18), such as digital micro-mirror array (DMA). In one aspect, spectral components from a sample (24) are dispersed in space and modulated separately by the switching array, each element of which may operate according to a predetermined encoding pattern. The encoded spectral components can then be detected and analyzed. In a different aspect, the switching array (18) can be used to provide a controllable radiation source for illuminating a sample (24) with radiation patterns that have predetermined characteristics and separately encoded components. Various applications are disclosed.
Abstract:
A method and device for high speed spectroscopic constituent verification. The method includes the steps of illuminating the sample with broadband light and measuring two preselected wavelenghts of reflected light: a first narrow-range of wavelenghts lambda 1 that is not significantly absorbed by the constituent of interest, and a second narrow-range of wavelengths lambda 2 that is substantially absorbed by the constituent of interest. Given the two measurements of reflection, upper and lower thresholds are determined, the latter based on a percentage of the measured baseline reflected light of wavelengths lambda 1. Finally, the presence of the constituent of interest is indicated if the measure of reflected discriminant wavelength lambda 2 is within the upper and lower threshold measures of reflected baseline light lambda 1. The compact device that implements the above described method includes a base unit (10) housing a near-IR discriminator circuit with a pair of selective light sensors and a light source. A sensor unit connects to the base unit (10). The sensor unit includes a flexible neck (20) with a connecting block (24) attached at one end for mating with the base unit (10), and a hood assembly (30) attached at the other end for enclosing a light collecting and transmitting lens (32). The optics are connected by an optical fiber bundle inside the flexible neck.
Abstract:
The present invention provides a combination of first providing a coarse adjustment by varying the emitter (1-1 to 1-n) power and duration of the emitter/detector exposure time (SL-1 to SL-n), and then providing a fine adjustment by storing (13) a correction value for each photodetector element (5). The adjustement for each photodetector corrects not only for the range, but also for the offset, providing two correction values. In a preferred embodiment, the low (offset) and high (offset plus range) voltage reference levels for an analog to digital converter (8) are adjusted and stored for each photodector for each color.
Abstract:
레이저 입력으로부터 방출된 광의 스펙트럼의 대역폭을 측정하기 위한 대역폭 측정기 장치 및 방법으로서, 레이저로부터 방출된 광의 대역폭을 나타내는 제1파라미터를 나타내는 제1출력 및 레이저로부터 방출된 광의 대역폭을 나타내는 제2파라미터를 나타내는 제2출력을 제공하는 광 대역폭 모니터; 및 실제 대역폭 파라미터를 계산하기 위해, 광 대역폭 모니터에 특정의 미리계산된 교정 변수를 사용하는 다변수 방정식의 일부로서 제1출력 및 제2출력을 사용하는 대역폭 계산 장치를 포함하고, 다변수 방정식은 대칭 민감 항을 포함하는 레이저 입력으로부터 방출된 광의 스펙트럼의 대역폭을 측정하기 위한 대역폭 측정기 장치 및 방법이 개시된다. 레이저 입력, 대역폭 측정기, 스펙트럼 대역폭, 제1파라미터, 제1출력, 제2파라미터, 제2출력, 광 대역폭 모니터, 다변수 방정식, 실제 대역폭 계산 장치, 대칭성 민감 항.