Abstract:
A flow cell for transporting fluid in a radiant energy field includes a cell structure having an open channel, and one or more end caps having a protrusion extending therefrom, wherein the protrusion may be inserted into the open channel to create a fluid seal. In a particular embodiment, the end caps include open channels for transporting fluid and radiant energy therethrough, and the open channel in the cell structure includes an efficient radiant energy transmission lining that is spaced from the end cap protrusions, thereby forming a gap volume in the flow cell open channel, which gap volume may be calibrated such that radiant energy losses may be standardized in respective flow cells transporting fluids having various indexes of refraction.
Abstract:
A method of measuring light reflected by a test sample with a microscopic photometric system. The test sample placed in an in-focus position of an objective is irradiated, and light reflected by the test sample is measured. Stray light generated by microscopic optics including the objective is measured with the test sample placed in an out-of-focus position of the objective. Light actually reflected by the test sample is determined from a difference between the reflected light and the stray light measured.
Abstract:
A molecular characterization detector includes a scattering cell containing a sample for molecular characterization, a light source for directing a light beam through the cell so that the light beam is scattered by the sample, optical elements for selecting from the scattered light a measurement beam comprising light that is scattered by the sample from a predetermined portion of the cell in a predetermined range of angles relative to the optical axis, and a detector for detecting the measurement beam and providing an output electrical signal representative of the measurement beam. The detector typically selects light scattered from a central portion of the scattering cell at angles in the range of 14.degree. to 16.degree.. A single spherical lens is preferably utilized. As a result, interference from stray scattered light is minimized. A beam dump attenuates the light beam after it passes through the scattering cell. Additional detectors detect light scattered at 90.degree. to the light beam. The outputs of the detectors are processed to provide molecular characterization of the sample.
Abstract:
The invention relates to an apparatus for distinguishing cultured pearls from natural pearls by piercing the unidentified pearls with beams of light, preferably polarized, to reveal gross structural differences. The apparatus uses a light source, a polarizing filter, opaque shields, micro ports for light limitations, field magnifying lenses preferably 10.times.or 12.times., and slides and other positioners to hold pearls singly or in strings.
Abstract:
An apparatus is disclosed for measuring the spectra of a high optical density sample having substantially known optical properties. In a preferred embodiment, the apparatus comprises: a laser for producing a light beam; a Raman cell responsive to the light beam for generating a first light containing a plurality of preselected wavelength components; an optical system for directing the first light through the sample; a dispersion device for spatially separating the first light passed through the sample into its plurality of preselected wavelength components; a plurality of light detectors positioned to respectively receive the spatially-separated preselected wavelength components and to convert the photons in each of the spatially-separated preselected components into a plurality of associated photocurrents having amplitudes respectively representative of the numbers of photons in the spatially-separated preselected wavelength components; and a photon counter for respectively converting the plurality of associated photocurrents into a plurality of photon counts corresponding to the transmittance of the sample at the respective preselected wavelength components of the first light passing through the sample. In a modification of the invention, the apparatus further includes an energy meter adapted to receive a portion of the light beam for generating an energy signal representative of the total energy in the light beam, and processing means responsive to the plurality of photon counts and to the energy signal for determining the output transmittance of the sample at the preselected wavelength components of the first light passing through the sample.
Abstract:
A two-stage light collector, including a first stage which admits a scanning beam and a second stage which is optically connected to the first stage and has a light detector therein. The first stage has a shape which re-images diffusely scattered radiation from a target on which the radiation impinges. The first stage directs light toward an entrance aperture in the second stage which indirectly reflects light toward the detector associated with the second stage.
Abstract:
The invention relates to a detector system for measuring the intensity of a radiation scattered at a predetermined angle from a sample (10) irradiated at a specified angle of incidence. The detector system comprises a path to transmit an incident beam of radiation onto the sample (10) and at least one radiation sensor (15,16,17,18; 35,36, . . . ; 45) positioned in the path of the radiations scattered from the sample (10). According to the invention the detector system has a dome positioned in the path of the radiation scattered from the sample (10). The dome is provided with at least one concave reflecting surface (11,12,13,14; 31,32, . . . ; 41) located in a range corresponding to the predetermined scattering angle, and the or each concave reflecting surface forms the image of the sample (10) onto a radiation sensor (15,16,17,18; 35,36, . . . ; 45). For example a 0.degree./45.degree. detector system is preferably arranged so that in the middle of the dome an opening (19) is provided suitable to let the incident beam of radiation fall onto the sample (10), and the dome is provided with at least two concave reflecting surfaces (11,12,13,14; 31,32, . . . ) located symmetrically with respect to the sample (10). A 45.degree./0.degree. detector system can be accomplished so that the dome is a member (44) provided with a rotationally symmetrical concave reflecting surface (41) positioned opposite the sample (10), radiation sensor (45) is disposed at the tip of said concave reflecting surface (41), and in the path of the incident beam there are an outside reflecting surface of revolution (42) of that member (44) as well as a further reflecting surface of revolution (43), the latter reflecting the beam of radiation coming from said outside reflecting surface (42) onto the sample (10) at the specified angle of incidence (FIG. 1).
Abstract:
An egg identification system for determining egg viability is provided. Such a system includes an emitter assembly for emitting electromagnetic radiation toward a plurality of eggs positioned proximate thereto. A detector assembly is positioned proximate to the emitter assembly. The detector assembly has a plurality of detectors fixedly positioned with respect to the emitter assembly and configured to detect electromagnetic radiation transmitted through the eggs. An optical shielding assembly is configured to move with respect to the detectors. A processor is in communication with detector assembly and is configured to determine viability of the eggs using the detected electromagnetic radiation. An associated method is also provided.
Abstract:
Various embodiments of a light detection device (10) and a method of using the device (10) are disclosed. In one or more embodiments, the light detection device (10) includes a housing (12) that extends along a housing axis (4) between top and bottom surfaces (14, 16). The device (10) also includes a port (20) that is adapted to receive a sample, and a door (30) connected to the housing (12). The door (30) includes an actuator portion (32) adapted to selectively move the door (30) between a closed position (6) and an open position (8), and a cover portion (34) connected to the actuator portion (32) and adapted to close the port (20) when the door (30) is in the closed position (6) and open the port (20) when the door (30) is in the open position (8) to allow external access to the port (20).