Abstract:
Systems and methods are provided herein. An exemplary system may include a laser source, the laser source having a laser center wavelength; at least one narrowband optical element receiving light emitted by the laser, the narrowband optical element having a filter center wavelength, the narrowband optical element being arranged such that the filter center wavelength is initially spectrally aligned with the laser center wavelength, the filter center wavelength changing in response to a temperature change such that the filter center wavelength is not substantially aligned with the laser center wavelength; and a passive adjustment mechanism coupled to the narrowband optical element, the passive adjustment mechanism including an actuator, the actuator moving in response to the temperature change, the actuator motion rotating the narrowband optical element, the rotation compensating for the temperature change such that the filter center wavelength and laser center wavelength remain spectrally aligned.
Abstract:
Methods and systems for spectrometer dark correction are described which achieve more stable baselines, especially towards the edges where intensity correction magnifies any non-zero results of dark subtraction, and changes in dark current due to changes in temperature of the camera window frame are typically more pronounced. The resulting induced curvature of the baseline makes quantitation difficult in these regions. Use of the invention may provide metrics for the identification of system failure states such as loss of camera vacuum seal, drift in the temperature stabilization, and light leaks. In system aspects of the invention, a processor receives signals from a light detector in the spectrometer and executes software programs to calculate spectral responses, sum or average results, and perform other operations necessary to carry out the disclosed methods. In most preferred embodiments, the light signals received from a sample are used for Raman analysis.
Abstract:
A spectrometer configurable for field analyses of chemical properties of a material is provided. The spectrometer includes: at least one sensor adapted for providing Fourier transform infrared spectroscopy (FTIR) surveillance and at least another sensor for providing Raman spectroscopy surveillance. The spectrometer can be provided with a user accessible instruction set for modifying a sampling configuration of the spectrometer. A method of determining the most likely composition of a sample by at least two technologies using the spectrometer is also provided.
Abstract:
A method of weather observations by a constellation comprises at least a first duster of three micro-satellites each orbiting around earth, and each micro-satellites comprises a spectrometer. Orbiting the three micro-satellites of the first duster around the earth in three separate orbits offset with respect to one another. Staggering the three micro-satellites with respect to one another as they orbit. Selecting the offset and the staggering, of each of the three micro-satellites with respect to one another, so that each one of the three micro-satellites have a substantially identical viewing area as each one of the three micro-satellites orbits around the earth. Sequentially collecting observations, from each of the three micro-satellites, as the micro-satellites orbit around the earth and observe substantially identical viewing areas, to separately gather atmospheric measurements and provide critical data for weather forecasting by infrared temperature and humidity soundings and motion vector winds of the earth.
Abstract:
The application presented herein focuses on the gas flow control for the evaluation of lactose intolerance but is also consistent with flow control required in diverse applications such as, but not limited to: analysis of other disease states (either using chemical markers or using naturally occurring chemical composition analysis) from breath samples, analysis of chemical concentrations of contaminants in naturals gas production/delivery and in petrochemical processing, analysis of air samples for the detection of drugs and or explosives, detection of chemical composition for the optimization of growth of biological species and or compounds such as in fish farming and or phyto-plancton farming, and finally in the detection of release of carbon dioxide in the determination of an earthquake event.
Abstract:
A method for determining a chance to enable a zeroing of gas analysis is disclosed herein. The method includes emitting radiation, and receiving emitted radiation, the received radiation comprising a first wavelength range absorbed by the at least one desired gas component and one or more disturbing factor, and a second wavelength range absorbed by the disturbing factor, the first wavelength range differing from the second wavelength range. The method also includes providing to a processing unit a first signal data indicative of a concentration of the at least one desired gas component and absorption of the disturbing factor, and a second signal data indicative of absorption of the disturbing factor. The method also includes determining a stability of the first and second signal data as a function of time, and if they are substantially stable enabling the zeroing to improve a measurement accuracy.
Abstract:
A control unit for controlling the temperature of a spectrometer to be constant stores a first temperature coefficient indicating a proportion of a temperature change of the spectrometer to a room temperature change and a second temperature coefficient indicating a proportion of the temperature change of the spectrometer to a change in the air volume of blower means, and calculates the amount of change in the air volume of the blower means necessary to offset a change in the temperature of the spectrometer from a predetermined constant temperature, by using the first temperature coefficient and the second temperature coefficient, and controls driving of the blower means based on the calculated amount of change in the air volume.
Abstract:
The invention relates to a calibration radiation source comprising the following: a housing (2) having an opening (12), a board (22) held in the housing (2), a semiconductor radiation source (18) mounted on the board (22) for generating a light beam, and an exit opening support element (14) having, in the area of the opening (12), a light exit opening (15) through which the light beam radiates outwards from the housing (2). The exit opening support element (14) is decoupled from the housing (2), and is attached to the board (22) of the semiconductor radiation source (18).
Abstract:
A wavelength monitor monitors wavelengths of laser beams emitted from a laser source and transmitted through a collimating lens. The wavelength monitor comprises an etalon that serves as an optical filter, and an optical detector. The etalon has a transmittance that is periodic with respect to a frequency, and is disposed such that a pair of collimated beams, emitted through a pair of emitting ports of the laser source and then transmitted through the collimating lens, is incident on the optical filter at symmetrically positive and negative angles. The optical detector receives the pair of collimated beams transmitted through the etalon, and detects the intensities of the pair of collimated beams.
Abstract:
An optical pressure sensor is disclosed having a pressure sensing optical cavity. A temperature sensing optical cavity at the sensor head is used by an interrogator to correct a pressure signal for effects of temperature. The optical cavities may be, for example, Fabry Perot cavities in the sensor head.