Abstract:
An apparatus for measuring light properties includes a housing defining a light input port; as well as a first light detector; a second light detector; and a coupling element. The first light detector is a single channel light detector or a multiple channel light detector. The second light detector is a multiple channel light detector. The coupling element is configured and arranged to selectively couple light incident from the light input port to one of the first light detector and the second light detector. As an alternative, a beam splitting element can be used instead of the coupling element. The beam splitting element receives light from the light input port and then splits the light and delivers a portion of the light to the first light detector and a portion of the light to the second light detector.
Abstract:
In a wavelength calibration method, an observed spectrum of a light that has a wavelength band is obtained, wherein the light has at least an attenuated wavelength component that corresponds to at least a predetermined absorption wavelength that is included in the wavelength band. A corrected spectrum is then obtained from the observed spectrum, wherein the corrected spectrum has reduced dependencies upon the full width at half maximum of an emission band of the light and upon an intensity ripple period of the light.
Abstract:
A spectrometer system includes a thermal light source for illuminating a sample, where the thermal light source includes a filament that emits light when heated. The system additionally includes a spectrograph for measuring a light spectrum from the sample and an electrical circuit for supplying electrical current to the filament to heat the filament and for controlling a resistance of the filament. The electrical circuit includes a power supply that supplies current to the filament, first electrical components that sense a current through the filament, second electrical components that sense a voltage drop across the filament, third electrical components that compare a ratio of the sensed voltage drop and the sensed current with a predetermined value, and fourth electrical components that control the current through the filament or the voltage drop across the filament to cause the ratio to equal substantially the predetermined value.
Abstract:
A spectrometer assembly (10) is disclosed. The assembly includes a light source (11) with a continuous spectrum. A pre-monochromator (2) generates a spectrum with a relatively small linear dispersion from which a spectral portion is selectable, the spectral bandwidth of the spectral portion being smaller than or equal to the bandwidth of the free spectral range of the order in the echelle spectrum. The centre wavelength of the selected spectral interval is measurable with maximum blaze efficiency. The assembly also includes an echelle spectrometer (4) with means for wavelength calibration, an entrance slit (21) at the pre-monochromator (2), an intermediate slit assembly (50) with an intermediate slit (3) and a spatially resolving light detector (5) in the exit plane of the spectrometer for the detection of wavelength spectra.
Abstract:
It is an object to provide a time-domain pulsed spectroscopy apparatus in which time-domain pulsed spectroscopy of multiple samples, states thereof, and so on can be carried out easily and in a short period of time. A time-domain pulsed spectroscopy apparatus of the present invention comprises a pulsed laser light source; a splitting unit configured to split pulsed laser light from the pulsed laser light source into excitation pulsed laser light and detection pulsed laser light; a pulsed-light emitting unit; a detector; a sample holder configured to hold the sample; and sample-unit entrance and exit optical systems configured to guide the pulsed light from the pulsed-light emitting unit to the sample and to guide to the detector pulsed light reflected from or transmitted through the sample due to the irradiation; wherein the time-domain pulsed spectroscopy apparatus further comprises: at least one optical-path-length varying unit for setting a photometric range, disposed in an incident-side optical path from the splitting unit to the pulsed-light emitting unit and/or in a detection-side optical path from the splitting unit to the detector; and at least one optical delay unit for the wave form signal measurement, disposed in the incident-side optical path from the splitting unit to the pulsed-light emitting unit and/or in the detection-side optical path from the splitting unit to the detector.
Abstract:
Disclosed are photometric methods and devices for determining optical pathlength of liquid samples containing analytes dissolved or suspended in a solvent. The methods and devices rely on determining a relationship between the light absorption properties of the solvent and the optical pathlength of liquid samples containing the solvent. This relationship is used to establish the optical pathlength for samples containing an unknown concentration of analyte but having similar solvent composition. Further disclosed are methods and devices for determining the concentration of analyte in such samples where both the optical pathlength and the concentration of analyte are unknown. The methods and devices rely on separately determining, at different wavelengths of light, light absorption by the solvent and light absorption by the analyte. Light absorption by the analyte, together with the optical pathlength so determined, is used to calculate the concentration of the analyte. Devices for carrying out the methods particularly advantageously include vertical-beam photometers containing samples disposed within the wells of multi-assay plates, wherein the photometer is able to monitor light absorption of each sample at multiple wavelengths, including in the visible or UV-visible region of the spectrum, as well as in the near-infrared region of the electromagnetic spectrum. Novel photometer devices are described which automatically determine the concentration of analytes in such multi-assay plates directly without employing a standard curve.
Abstract:
An optical system for determining an optical constant by measuring the absolute reflectance and the absolute transmittance of a substance by using an incoming side beam switching mirror for selectively switching the direction of a light from a light source to first or second converged light reflecting units. The first and second converged light reflecting units project the light from the beam switching mirror so as to be converged in an intersecting manner at the position of a sample holder that can be positioned to present a sample fitting hole or a through hole for measuring the reflectance/transmittance by providing the light to an exit side beam switching mirror and detector.
Abstract:
A modular dual-beam source, sample compartment and beam-combining system are provided when used with a monochromator and detector to form a spectrophotometer consisting of: (a) a source module where two ellipsoidal mirrors each produce an image of the light source, and (b) a reflecting sample-compartment module, wherein each side has two plane-mirrors, of the four plane mirrors, three are reference and one is the sample, or (c) a transmission sample-compartment module, wherein each side has two plane-mirrors, and a sample is placed between one pair of plane-mirrors, and (d) a beam-combining module wherein the source images are imaged by a second pair of ellipsoidal mirrors on a reflective chopper that combines the images at a single location that is imaged, external to the module, by another mirror, each module being kinematically located with respect to each other so the system remains optically aligned as modules are interchanged.
Abstract:
A system for predicting blood constituent values in a patient includes a remote wireless non-invasive spectral device, the remote wireless non-invasive spectral device generating a spectral scan of a body part of the patient. Also included are a remote invasive device and a central processing device. The remote invasive device generates a constituent value for the patient, while the central processing device predicts a blood constituent value for the patient based upon the spectral scan and the constituent value.
Abstract:
Time-divisionally-multiplexed light receiving signals are sampled at a predetermined time interval as they are, and then converted into digital data. Then, address is determined based on an index signal as a standard of the time-divisional multiplexing, and the data are sequentially stored in a data memory. When the data are sequentially read out, change of quantity of the data is obtained to determine a period having the smallest change in quantity as an effective period. Then, the data included in the effective period are selected and separated to a sample side beam, reference side beam and cutoff period. Thus, the multiplexed light receiving signals are accurately separated by the digital data.