Abstract:
Wavenumber linear spectrometers are provided including an input configured to receive electromagnetic radiation from an external source; collimating optics configured to collimate the received electromagnetic radiation; a dispersive assembly including first and second diffractive gratings, wherein the first diffraction grating is configured in a first dispersive stage to receive the collimated electromagnetic radiation and wherein the dispersive assembly includes at least two dispersive stages configured to disperse the collimated input; and an imaging lens assembly configured to image the electromagnetic radiation dispersed by the at least two dispersive stages onto a linear detection array such that the variation in frequency spacing along the linear detection array is no greater than about 10%.
Abstract:
A liquid fuel property detection apparatus includes a fuel passage, a light emitting device for emitting a light including a plurality of predetermined wavelengths toward the fuel in the passage, a light receiving device for receiving the light passing through the fuel, and a calculation unit for calculating the concentration of at least one of aroma, paraffin and olefin, which are hydrocarbon component components contained in the fuel. The calculation unit calculates the concentration of a specific component, which is one of aroma, paraffin and olefin, based on the reference transmittance of light in the specific component and the actual transmittance calculated from the amount of light emitted by the light emitting device and the amount of light received by the light receiving device with respect to each wavelength of the light.
Abstract:
A linear axis spectral analysis system is enclosed. The spectral analysis system utilizes a prism-volume holographic transmission grating-prism combination to achieve a linear axis between input and detector. This design, when held with low thermal expansion materials, is extremely insensitive to temperature and vibration, allowing for enhanced accuracy without the need of temperature control. Further, the spectral analysis system provides the ability for extreme compactness.
Abstract:
Detector apparatus includes a dispersive prism (10) and a diffraction grating (11) of the type which produces only zero and first order diffraction patterns. Located behind the diffraction grating (11) so as to interact with the first harmonic content of the diffraction patterns is a Moire grating (12) having half the pitch of the diffraction grating (11). Detector means including at least two pairs of detectors (13-16) is located behind the Moire grating (12) to detect the presence of Moire fringes.
Abstract:
A spectral feature selection apparatus includes a dispersive optical element arranged to interact with a pulsed light beam; three or more refractive optical elements arranged in a path of the pulsed light beam between the dispersive optical element and a pulsed optical source; and one or more actuation systems, each actuation system associated with a refractive optical element and configured to rotate the associated refractive optical element to thereby adjust a spectral feature of the pulsed light beam. At least one of the actuation systems is a rapid actuation system that includes a rapid actuator configured to rotate its associated refractive optical element about a rotation axis. The rapid actuator includes a rotary stepper motor having a rotation shaft that rotates about a shaft axis that is parallel with the rotation axis of the associated refractive optical element.
Abstract:
A smart phone or tablet includes a first part having at least one laser diode configured to be pulsed, and a second part having at least one other laser diode, the laser diodes configured to generate near-infrared light, wherein at least some of the laser diodes comprise a distributed Bragg reflector, with some laser diode light directed to tissue including skin. An array of laser diodes generates near-infrared light and includes one or more distributed Bragg reflectors. An assembly in front of the array to forms light spots on the tissue. A first receiver includes detectors that receive light reflected from the tissue. An infrared camera generates data from light reflected from the tissue. The smart phone or tablet generates a two-dimensional or three-dimensional image or mapping using the infrared camera data, and includes a wireless receiver, a wireless transmitter, a display, a voice input module, and a speaker.
Abstract:
A smart phone or tablet includes pulsed laser diodes generating light with near-infrared wavelengths between 700-2500 nanometers. First lenses direct light from the laser diodes to tissue. An array of pulsed laser diodes generates light with near-infrared wavelengths between 700-2500 nanometers. Second lenses form light from the array into spots directed on the tissue. An infrared camera synchronized to the laser diodes and the array generates data based on light reflected from the tissue. The smart phone or tablet generates a two-dimensional or three-dimensional image using the data from the infrared camera. The smart phone or tablet includes a wireless receiver, a wireless transmitter, a display, a voice input module, and a speaker.
Abstract:
A spectral feature selection apparatus includes a dispersive optical element arranged to interact with a pulsed light beam; three or more refractive optical elements arranged in a path of the pulsed light beam between the dispersive optical element and a pulsed optical source; and one or more actuation systems, each actuation system associated with a refractive optical element and configured to rotate the associated refractive optical element to thereby adjust a spectral feature of the pulsed light beam. At least one of the actuation systems is a rapid actuation system that includes a rapid actuator configured to rotate its associated refractive optical element about a rotation axis. The rapid actuator includes a rotary stepper motor having a rotation shaft that rotates about a shaft axis that is parallel with the rotation axis of the associated refractive optical element.