Abstract:
An apparatus and method for analysing a gas of the kind adapted to produce an interference pattern displacements of which are indicative of changes of the constitution of the gas involves exposing an array 8 of photosensitive elements to the interference pattern. Respective digital indications of the intensity of the interference pattern falling on the elements are produced by means of a timing circuit 16 adapted to clock data out of the array 8 as a series of analogue pulses which are held by a fast peak detector 17 and converted by an analogue-to-digital converter 18 into digital indications. The position of a principal peak of the interference pattern is then determined by means of a microprocessor (not shown) adapted to determine the best fit of the digital indications with appropriate pre-stored values.
Abstract:
컴퓨터에 의해 구현되는 방법이 개시된다. 이 방법은, 프로세서를 사용하여 타겟 코팅을 갖는 코팅된 표면으로부터 스펙트럼 반사율 데이터를 획득하는 단계(10)와, 프로세서를 사용하여 상기 데이터가 임의의 이상치 데이터 포인트를 포함하는지 여부를 판정하는 단계(18)를 포함한다. 상기 방법은 또한, 프로세서를 사용하여 이상치 데이터 포인트 중 적어도 하나를 제거하여 최종 스펙트럼 반사율 데이터를 생성하는 단계(32)와, 프로세서를 사용하여 최종 스펙트럼 반사율 데이터에 적어도 부분적으로 기초하여 타겟 코팅의 특성을 계산하는 단계(34)를 포함한다.
Abstract:
PROBLEM TO BE SOLVED: To reduce the amount of work relating to adjusting the position of a light-receiving element.SOLUTION: A light source generates light. A spectroscope separates the light generated from the light source and transmitted through a mixture of a sample and a reagent, for each wavelength. A light-receiving part 8 includes plural light-receiving elements 81 for receiving light from the spectroscope. The plural light-receiving elements 81 each receive light relevant to a wavelength band corresponding to the arranged position and generate a signal corresponding to the received light. A storage part 11 stores plural light-receiving element identifiers and plural wavelength-band identifiers by correlating the former with the latter. A selection part 13 selects, from among the plural light-receiving elements, a specific light-receiving element corresponding to a specific light-receiving element identifier correlated with a wavelength-band identifier of a wavelength band corresponding to a measurement item of the sample. A calculation part 15 calculates absorbance relating to a measurement item on the basis of a signal from the selected specific light-receiving element.
Abstract:
PROBLEM TO BE SOLVED: To improve the S/N ratio of spectrum.SOLUTION: A spectrometer includes: integrating means for integrating M pieces of spectral data of the number N of data points obtained by repeating the same measurement M times or time domain data S1(d1-dN)-SM(d1-dN); correlation calculating means for calculating correlation between each of sets S1(dN)-SM(dN) of data points of the same ordinal number dn, included in the M pieces of the spectral data or the time domain data S1(d1-dN)-SM(d1-dN), and thereby obtain correlation data C(c1-cN) representing the strength of the correlation concerning the data points of each of the ordinal number; and calculating means for calculating the product of spectrum which is obtained by integration of the number N of the data points obtained by the correlation calculating means or expected spectra or time domain data Sav(d1-dN) with the correlation data C(c1-cN).
Abstract:
The invention relates to an actuation and evaluation circuit for a laser diode (1) and a photodiode (3) for determining the concentration of a gas. The laser diode can generate light in the range of an absorption line of the gas. The circuit comprises a driver (10, 11, 12, 13) for generating a driver signal (17) for the laser diode (1), an assembly (8, 9) for generating a reference signal (20), and a subtractor (5) for subtracting the reference signal (20) from the signal (21) supplied by the photodiode. The invention further relates to a measuring device for determining the concentration of a gas by way of such an actuation and evaluation circuit. Finally, the invention relates to a corresponding method.
Abstract:
A spectrometer producing spectra with improved S/N. The spectrometer has: accumulation means for performing a measurement to obtain a data set containing N data points, repeating the measurement M times to obtain M spectral data sets or time-domain data sets S1 (d1 to dN) to SM (d1 to dN), and accumulating the M spectral data sets or time-domain data sets; means for creating sets S1 (dn) to SM (dn) of the data points contained in the M spectral data sets or time-domain data sets S1 (d1 to dN) to SM (d1 to dN) such that the data points of each one of the sets S1 (dn) to SM (dn) have the same ordinal number dn; correlation computing means for finding correlations between the sets S1 (dn) to SM(dn) to thereby find a correlation data set C(c1 to cN) indicating correlation strengths about the data points of the ordinal numbers; and computing means for finding either the product of an accumulated or anticipated spectrum having the N data points and obtained from the accumulation means or of a time-domain data set Sav(d1 to dN) and the correlation data set C(c1 to cN).