Abstract:
The present invention is based on the knowledge that the advantages of a moveable dispersive element with regard to the simple detector element and the adjustability of the measurement range and the resolution can also be used in a miniaturization of a spectrometer, when the dispersive element is operated generally in resonance instead by a quasistatic drive. A proposed spectrometer comprises a vibratably suspended dispersive element for spectrally decomposing a light beam, whose spectral distribution is to be determined, into spectral components, a means for putting the vibratably suspended dispersive element into a vibration with a frequency, which is in such a ratio to the natural frequency of the vibratably suspended dispersive element that a resonance amplification of the voltage of the dispersive element occurs, and a detector for detecting a spectral component of the light beam.
Abstract:
A spectral image measurement apparatus comprises: a spectral element array; a spectral element drive section for driving the elements; an inlet-side optical system for guiding a light to the element array; a detection-side optical system for forming an image with a diffracted light output from the element array; and an array sensor for detecting the diffracted light through the detection-side optical system. The element array includes: a substrate; and a plurality of micro-electrically-driven mechanical spectral elements arranged two-dimensionally on the substrate, wherein each of the elements comprises a diffraction grating having a diffraction surface, the diffraction grating being pivotably supported on the substrate; wherein each of the elements generates spectra from a light entering the diffraction surface by applying an electric field to the diffraction grating to tilt the diffraction grating; and wherein each of tilt angles of the diffraction gratings is capable of being set individually.
Abstract:
The present invention provides a simple, robust, and versatile high-resolution spectrometer that is suitable for downhole use. The present invention provides a method and apparatus incorporating a spinning, oscillating or stepping optical interference filter to change the angle at which light passes through the filters after passing through a sample under analysis downhole. As each filter is tilted, the color or wavelength of light passed by the filter changes. Black plates are placed between the filters to isolate each filter's photodiode. The spectrometer of the present invention is suitable for use with a wire line formation tester, such as the Baker Atlas Reservation Characterization Instrument to provide supplemental analysis and monitoring of sample clean up. The present invention is also suitable for deployment in a monitoring while drilling environment. The present invention provides a high resolution spectometer which enables quantification of a crude oil's percentage of aromatics, olefins, and saturates to estimate a sample's gas oil ratio (GOR). Gases such as CO2 are also detectable. The percentage of oil-based mud filtrate contamination in a crude oil sample can be estimated with the present invention by using a suitable training set and chemometrics, a neural network, or other type of correlation method.
Abstract:
An optical spectrum analyzer (OSA) 10 sequentially or selectively samples (or filters) a spectral band(s) 11 of light from a broadband optical input signal 12 and measures predetermined optical parameters of the optical signal (e.g., spectral profile) of the input light 12. The OSA 10 is a free-space optical device that includes a collimator assembly 15, a diffraction grating 20 and a mirror 22. A launch pigtail emits into free space the input signal through the collimator assembly 15 and onto the diffraction grating 20, which separates or spreads spatially the collimated input light, and reflects the dispersed light onto the mirror 22. A null/4 plate 26 is disposed between the mirror 22 and the diffraction grating 20. The mirror reflects the separated light back through the null/4 plate 26 to the diffraction grating 20, which reflects the light back through the collimating lens 18. The lens 18 focuses spectral bands of light (null1-nullN) at different focal points in space. One of the spectral bands 11 is focused onto a receive pigtail 28, which then propagates to a photodetector 30. A pivoting mechanism 34 pivots the diffraction grating 20 or mirror 22 about a pivot point 36 to sequentially or selectively focus each spectral band 11 to the receive pigtail 28. A position sensor 42 detects the displacement of the diffraction grating 24 or mirror.
Abstract translation:光谱分析仪(OSA)10顺序地或选择性地从宽带光输入信号12采样(或滤波)光谱带11,并且测量输入的光信号的光学参数(例如,光谱分布) OSA 10是自由空间光学装置,其包括准直器组件15,衍射光栅20和反射镜22.发射尾纤通过准直器组件15将信号发射到自由空间中,并将其输入到衍射光栅20上 ,其在空间上分离或扩展准直的输入光,并将分散的光反射到反射镜22上.λ/ 4板26设置在反射镜22和衍射光栅20之间。反射镜将分离的光反射回λ/ 4板26连接到衍射光栅20,其通过准直透镜18反射光。透镜18将光(λ1-λN)的光谱带聚焦在空间中的不同焦点处。 光谱带11中的一个聚焦在接收引线28上,接收引线28然后传播到光电检测器30.枢转机构34围绕枢转点36枢转衍射光栅20或反射镜22,以顺序地或选择性地将每个光谱带11聚焦到 接收尾纤28.位置传感器42检测衍射光栅24或反射镜的位移。
Abstract:
A spectroscopic system according to the present invention 10 comprises: an optical fiber bundle 12 whose emitting end 12a is arranged in a vertical direction; a slit 16 which is arranged so as to oppose the emitting end 12a of the optical fiber bundle 12; spectroscopic element arrangement means 20 which can switchably arrange either a first diffraction grating 23 in which grooves extending along the vertical direction are arranged in a horizontal direction at a predetermined groove density, or a second diffraction grating 24 in which grooves extending along the vertical direction are arranged in the horizontal direction at a groove density larger than that of the first diffraction grating 23, on an optical path of light which is emitted from the emitting end 12a of the optical fiber bundle 12 and passes through the slit 16; and a photomultiplier tube 30 in which a plurality of anodes 53 extending along the vertical direction are arranged in the horizontal direction.
Abstract:
An FT-IR microscope is operated in association with a scanning spectrometer in such a way that incremental movement of the movable stage of 5 the microscope is synchronized with the scans of the scanning spectrometer. This minimizes delays in processing time.
Abstract:
The invention comprises a method of adapting derivative spectrometry for use in a downhole environment and addresses problems that are inherent in this environment. Such problems include, but are not limited to, elevated temperatures and scattering from particles residing within dirty fluid samples. The invention improves the resolution by measuring the first derivative of the spectrum. The derivative spectrometer of this invention operates by vibrating a linear variable interference filter back and forth along the plane of the filter or by oscillating a circular variable filter about some angle.
Abstract:
Light under measurement whose wavelength is continuously swept is incident on fiber-optic Etalon. The fiber-optic Etalon transmits the light under measurement each time the wavelength of the light under measurement satisfies specific conditions. A PD detects the transmitted light of the fiber-optic Etalon and outputs the intensity of the light under measurement. A counter counts the number of peaks of the output of the PD. A CPU calculates the wavelength of the light under measurement based on the count value of the counter.
Abstract:
A method for the wavelength calibration of echelle spectra, in which the wavelengths are distributed across number of orders is characterised by the steps: recording of a line-rich reference spectrum with known wavelengths for a number of the lines, determination of the position of a number of peaks of the reference spectrum in the recorded spectrum, selection of at least two first lines of known order, position and wavelength, determination of a wavelength scale for the order in which the known lines lie, by means of a fit function nullm(x), determination of a provisional wavelength scale nullnullm 1(x) for at least one neighbouring order m 1, by means of addition/subtraction of a wavelength difference nullFSR which corresponds to a free spectral region, according to nullm 1 null(x)null0nullm(x)nullFSR with nullFSRnullnullm(x)/m, determination of the wavelengths of lines in said neighbouring order m 1, by means of the provisional wavelength scale null 1(x), replacement of the provisional wavelength of at least two lines by the reference wavelength for said lines as obtained in step (a) and repeat of steps (d) to (g) for at least one further neighbouring order.
Abstract:
A fluorescence spectrophotometer having an excitation double monochromator, a coaxial excitation/emission light transfer module, and an emission double monochromator. Each monochromator includes a pair of holographic concave gratings mounted to precisely select a desired band of wavelengths from incoming broadband light without using other optical elements, such as mirrors. Selected excitation light is directed into a sample well by a light transfer module that includes a coaxial excitation mirror positioned to direct excitation light directly to the bottom of a well of a multi-well plate. Fluorescence emission light that exits the well opening is collected by a relatively large coaxial emission mirror. The collected emission light is wavelength selected by the emission double monochromator. Selected emission light is detected by a photodetector module.