Abstract:
A spectrometric system has a primary channel with a signal waveform and a reference channel with a signal waveform. A digital representation of the primary signal waveform and a digital representation of the reference signal waveform to provide a digital output representing the primary signal at datum points synchronized with the reference signal are processed by computing the Fourier transform of the primary signal waveform and using a fast reverse non-uniform discrete Fourier Transform technique to compute the reverse non-uniform discrete Fourier transform of the Fourier transform of the primary signal waveform to provide the digital output representing the primary signal at datum points synchronized with the reference signal.
Abstract:
A flow-through gas cell and a method for passing a sample gas through a flow-through gas cell for spectroscopy are disclosed. In an embodiment, a flow-through gas cell is disclosed. The gas cell includes a substantially cylindrical interior cavity. The interior cavity comprises an inner surface that is reflective. In addition, the gas cell includes a gas inlet and a gas outlet. In the gas cell, a source is disposed on a side of the gas cell, and a detector is disposed on the same side of the gas cell as the source. The source emits electromagnetic radiation, and the detector detects electromagnetic radiation. The gas cell further includes mirrors disposed on opposing ends of the interior cavity.
Abstract:
A total transmission spectroscopy system for use in determining the analyte concentration in a fluid sample comprises a sample cell receiving area, a light source, a collimating lens, a first lens, a second lens, and a detector. The sample cell receiving area is adapted to receive a sample to be analyzed. The sample cell receiving area is constructed of a substantially optically clear material. The collimating lens is adapted to receive light from the light source and adapted to illuminate the sample cell receiving area with a substantially collimated beam of light. The first lens is adapted to receive regular and scattered light transmitted through the sample at a first angle of divergence. The first lens receives light having a first angle of acceptance. The first lens outputs light having a second angle of divergence. The second angle of divergence is less than the first angle of divergence. The second lens is adapted to receive light from the first lens and adapted to output a substantially collimated beam of light. The detector is adapted to measure the light output by the second lens.
Abstract:
An apparatus for inspecting a wafer includes a light source, a detecting part and a signal analyzing part. The light source emits a light onto the wafer, and the detecting part detects a radiation light emitted from the wafer by the light and generates a signal. The signal analyzing part analyzes the signal generated by the detecting part and determines whether a defect has been formed on the wafer.
Abstract:
The inventive subject matter relates to a method for detecting the presence of a biological substance of interest in a test sample of saliva or oral fluid, comprising combining said test sample with a fluorescence-labeled ligand to said biological substance and detecting a change in the fluorescence polarization of said test sample produced by binding of said fluorescence-labeled ligand to said biological substance. In one aspect of the inventive subject matter, said method comprises additional steps for comparing the fluorescence polarization of said test sample with the fluorescence polarization of a control solution. Also provided is a miniaturized, portable apparatus for measuring the fluorescence polarization of a liquid sample.
Abstract:
In one general aspect, a spectroscopic apparatus is disclosed for investigating heterogeneity of a sample area. The apparatus includes an image acquisition system operative to acquire images of a plurality of sub-areas in the sample area and a sub-area selection interface operative to receive a selection designating one of the sub-areas for which an image has been obtained. A spectrometer has a field of view and is operative to acquire a spectrum of at least part of one of the sub-areas in its field of view, and a positioning mechanism is responsive to the sub-area selection interface and operative to position the field of view of the spectrometer relative to the sample area based on a received selection.
Abstract:
Echelle gratings and microelectromechanical system (MEMS) digital micromirror device (DMD) detectors are used to provide rapid, small, and highly sensitive spectrometers. The new spectrometers are particularly useful for laser induced breakdown and Raman spectroscopy, but could generally be used with any form of emission spectroscopy. The new spectrometers have particular applicability in the detection of improvised explosive devices.
Abstract:
A surface inspection of the system applies a first oblique illumination beam and may also apply a second illumination beam to illuminate a surface either sequentially or simultaneously. Radiation reflected or scattered is collected by preferably three collection channels and detected by three corresponding detector arrays, although a different number of channels and detector arrays may be used. One or both illumination beams are focused to a line on the surface to be inspected and each line is imaged onto one or more detector arrays in the up to three or more detection and collection channels. Relative motion is caused between the lines and the surface inspected in a direction perpendicular to the lines, thereby increasing throughput while retaining high resolution and sensitivity. The same detection channels may be employed by detecting scattered or reflected radiation from both illumination beams. Fourier filters may be employed to filter out diffraction at one or more different spatial frequencies.
Abstract:
An electrolytic method and apparatus for treating a solution sample allowing for the accurate and substantially real-time and on-line analysis of trace contaminants in the solution sample. The method of the present invention includes two stages. The solution sample is electrolyzed during a first stage to decompose the matrix, thereby substantially neutralizing the matrix, while during a second stage deposited or precipitated metals are recovered and/or stabilized in solution. An apparatus for carrying out the method is also disclosed.
Abstract:
A detection apparatus includes a sample holding section, an irradiation means, a detection means, a calculation means, and an evaluation means. The irradiation means irradiates a substance held in the sample holding section with a THz wave. The detection unit detects a THz wave passed through or reflected from the substance. The calculation unit determines a frequency dependence of a property of the substance with respect to the irradiated THz wave and then calculates a slope of a straight line or a slope of a straight line obtained by straight-line approximation of the frequency dependence of the property of the substance. The evaluation unit evaluates the state change of the substance by comparing a previously-obtained slope of a straight line of the frequency dependence of the property of the substance in a standard state and the slope of the straight line of the substance calculated.