摘要:
The invention features methods including: (i) modulating multiple components (e.g., different spatial regions, different wavelengths, or both) of electromagnetic (EM) radiation emerging from an object with different time-varying functions; (ii) measuring at least one time-varying signal derived from the modulated EM radiation emerging from the object; and (iii) reconstructing information about the object based on the measured signal and the time-varying functions.
摘要:
A new architecture for implementing a time-resolved Raman spectrometer is 2-3 orders of magnitude faster than current systems. The system additionally is compact, environmentally rugged, low cost and can detect multiple components of a sample simultaneously. In one embodiment, the invention employs a rotating optical switch to time multiplex an input signal through multiple bandpass filters and into a single optical detector which is electrically activated only when the filtered input light pulse is about to impact it.The combination of time-multiplexing the input signal through multiple optical filters and time-sequencing the optical detector enables the device to detect and analyze 2-3 orders of magnitude faster than current designs, processing spectra within milliseconds instead of seconds. The system can process multiple material samples (25+) simultaneously, instead of sequentially, and its mechanical ruggedness and simplicity enables using the system in harsh physical environments when traditional spectrometers can not be used reliably.
摘要:
An apparatus for measuring the transport time of impurity particles in a plasma includes a spectrometer, a system for the spatially-resolving conversion into charge of light exiting the spectrometer, an integrator circuit for the spatially-resolving integration of the charge, as well as a display screen that presents the integrated charge as a series of spectral lines. The integrator circuit is assembled from discrete components. Thus, the transport of plasma impurities can be properly measured.
摘要:
A system for detecting controlled substances on an object including at least one laser for illuminating at least part of an object with laser energy and either a second harmonic detector or a luminescence controlled substance detector, or both. Additionally, a system also including a Raman scattering controlled substance detector is disclosed.
摘要:
An apparatus capable of observing an extremely small region and at the same time observing physical phenomena that occur in extremely short time spans on the order of, for example, several tens of picoseconds to femtoseconds, is provided. The apparatus includes a microscope, and a time-resolved spectroscopy unit, a first light-guiding unit for guiding light from the spectroscopy unit into the microscope, a second light-guiding unit for guiding the light from the microscope into the spectroscopy unit. The microscope includes an illuminating optical system and an observing optical system. The time-resolved spectroscopy unit includes an ultrashort optical pulse source, a beam splitter for splitting the ultrashort optical pulse into a reference beam and another beam, an optical system for generating a pump beam and a probe beam from the beam other than the reference beam, and an imaging device for time-resolved spectroscopy for capturing an interference pattern formed by the light guided by the second light-guiding unit and the reference beam. A two-dimensional lightwave conversion optical system is interposed between the second light-guiding unit and the imaging device.
摘要:
A fluorescence correlation spectroscopy analyzer 1 is equipped with an excitation light illuminating optical system 21, a fluorescence imaging optical system 22, a CCD camera 15, and a data analyzer 16. The excitation light illuminating optical system 21 illuminates excitation light onto a predetermined region of a measured sample S. The fluorescence imaging optical system 22 images the fluorescence generated at the measured sample S onto the photodetection surface of the CCD camera 15. The CCD camera 15 performs photoelectric conversion of the fluorescence made incident onto the photodetection surface in accordance with the respective pixels and outputs the charges generated by the photoelectric conversion as detection signals from an output terminal. The data analyzer 16 inputs the detection signals based on the charges generated at the pixels, among the pixels of the CCD camera 15, that belong to an analyzed pixel set and computes autocorrelation functions of the input detection signals according to each pixel. A fluorescence correlation spectroscopy analyzer, which is enabled to perform fluorescence correlation spectroscopy analysis on multiple points of a measured sample simultaneously and at high speed, is thus provided.
摘要:
The invention relates to a fluorescence measuring apparatus to which a CCD camera capable of measuring fluorescent components emitted from a specimen corresponding to excitation pulse components emitted at regular intervals toward the specimen is applied. The fluorescence measuring apparatus has at least a CCD and a controller. The CCD includes photoelectric converters for implementing photoelectric conversion of the fluorescent components emitted from the specimen, and charge storage elements for storing and transferring charges resulting from the photoelectric conversion by the photoelectric converters. The controller outputs an electronic shutter signal for sweeping away the charge resulting from the photoelectric conversion by each photoelectric converter, a readout signal for reading the charge resulting from the photoelectric conversion, to the charge storage element, and a transfer signal for sequentially transferring the charge thus read. In particular, the controller outputs the electronic shutter signal corresponding to generation of each excitation pulse component, outputs the readout signal corresponding to output of the electronic shutter signal, and outputs the transfer signal per predetermined number of readout signals outputted.
摘要:
A microscope comprising: a light sampler for collecting light from a measurement area of a sample; a multi-element detector having a plurality of photoelectric elements, for detecting the light collected by the light sampler, each photoelectric element corresponding to a minute measurement region in the measurement area with one-to-one correspondence; a Fourier transform spectrophotometer as a spectroscope; a data sampler for concurrently sampling intensity data sent from each photoelectric element of the multi-element detector at a timing determined by the Fourier transform spectrophotometer; and a data processor for obtaining time-resolved spectrum data for each minute measurement region according to temporally changed interference light data obtained by the data sampler.
摘要:
According to the invention, to analyse a non-limpid medium, this medium is lit by at least one light pulse, a spectral and temporal transmission image, in counting mode, is acquired from the lit medium, and the image and derivatives thereof are processed so as to acquire information about the non-limpid medium. The invention applies to the analysis of diffusing and absorbing media, for example milk.
摘要:
Disclosed is a measuring apparatus for a physical phenomenon by photoexcitation, in particular a delay time modulated and time-resolved, scanning probe microscope apparatus providing an ultimate resolution both temporal and spatial. The apparatus comprises an ultrashort laser pulse generator (2); a delay time modulating circuit (6) which splits an ultrashort laser pulse (3) produced by the ultrashort laser pulse generator (2) into two and which also modulates a delay time td between the two ultrashort laser pulses (4 and 5) with a frequency (ω); a scanning probe microscope (7); and a lock-in detection unit (8) which performs lock-in detection with the delay time modulation frequency (ω) of a probe signal (11) from the scanning probe microscope (7). It can detect the delay time dependency of the probe signal (11) as its differential coefficient to the delay time, with no substantial influence from fluctuations in the intensity of ultrashort laser pulses (3) while preventing the probe apex (19) from thermal expansion and shrinkage by repeated irradiation with ultrashort laser pulses (3). A photoexcited physical phenomenon dependent on a delay time between ultrashort laser pulses can thus be measured at a temporal resolution in the order of femtoseconds and at a spatial resolution in the order of angstroms.