Abstract:
A cartridge and cartridge system for use in an apparatus for analyzing a sample are provided. The system has a plurality of cartridges for different applications for a multimode instrument. The cartridges are removably engaged with a cartridge support in a “plug-in” format such that one cartridge may be removed from the apparatus and another cartridge may be easily installed. The cartridge support includes a plurality of cartridge positions that receive cartridges concurrently. One of the cartridges is a wavelength-tunable cartridge in which different light sources, excitation filters, and/or emission filters may be selected. Tuning is further accomplished by tilting the excitation or emission filters at desired angles relative to a beam of exciting light or emitted light.
Abstract:
A beam detector (10) including a light source (32), a receiver (34), and a target (36), acting in co-operation to detect particles in a monitored area (38). The target (36), reflects incident light (40), resulting in reflected light (32) being returned to receiver (34). The receiver (34) is a receiver is capable of recording and reporting light intensity at a plurality of points across its field of view. In the preferred form the detector (10) emits a first light beam (3614) in a first wavelength band; a second light beam (3618) in a second wavelength band; and a third light beam (3616) in a third wavelength band, wherein the first and second wavelengths bands are substantially equal and are different to the third wavelength band.
Abstract:
A particle detection system including; at least one light source adapted to illuminate a volume being monitored at least two wavelengths; a receiver) having a field of view and being adapted to receive light from at least one light source after said light has traversed the volume being monitored and being adapted to generate signals indicative of the intensity of light received at regions within the field of view of the receiver; a processor associated with the receiver adapted to process the signals generated by the receiver to correlate light received at least two wavelengths in corresponding regions within the field of view of the receiver and generate an output indicative of the relative level of light received at the two wavelengths.
Abstract:
An LED inspection lamp has plurality of LED sources for emitting electromagnetic radiation at different peak wavelengths for causing visible fluorescence in different leak detection dyes. A lens is associated with each LED. Radiation passing through lenses is superimposed in target area at target distance. Another LED inspection lamp has plurality of LEDs emitting electromagnetic radiation at a peak wavelength. A lens adaptor has lens housing for attachment to LED inspection lamp with a single LED for causing visible fluorescence, and a lens. Substantially all of the radiation from the LED passes through the lens and is focused in a target area at a target distance from the lenses. LED spot lights have a similar configuration. The LEDs may produce white light from distinct LEDs or from white LEDs. The light may be a flashlight or fixed spot light.
Abstract:
The present invention relates to a fluid detection system which can be adapted for use in applications including liquid-level detection, pipeflow monitoring, and interstitial leakage in double-walled containers. The system operates on principles of optics and provides the capability of remotely differentiating between fluids having different refractive indices including liquids and vapors. The present detector uses a unique light pulsation technique which increases permissible operating ranges over existing optical detection systems.
Abstract:
An apparatus and method are provided for measuring the hematocrit level of blood. The presently preferred embodiment comprises a light emitting device which emits an amount of light into a blood sample. This light travels through the blood sample to two light detecting devices positioned relative to the light emitting device in a predetermined geometry such that light emitted from the light emitting device must travel farther to reach one of the light detecting devices than to reach the other, thereby forming a light path from the light emitting device to one light detecting device which is longer than the path from the light emitting device to the other light detecting device. According to the present invention, the amount of light detected by one of the light detecting devices is regulated so that the amount of light detected is constant. Thereafter, the amount of light detected by the unregulated light detecting device is a linear representation of the hematocrit of the blood in the blood sample. The hematocrit sensor may be used within a plasma separator apparatus wherein the hematocrit measurement regulates the operating parameters of the autotransfusion system to maintain the hematocrit of the blood within a predetermined range.
Abstract:
A portable, hand held reflectometer which employs at least one blue light emitting diode for measuring the optical brightness of an opaque material, such as a stack or pad of paper is disclosed. A brightness measuring reflectometer which employs two blue light emitting diodes arranged so as to substantially reduce measured brightness variations caused by changing the orientation of the reflectometer relative to that of the fibers contained in a fibrous material such as paper whose brightness is to be measured is also disclosed. An ultraviolet light source such as a fluorescent lamp is also employed for measuring the brightness of paper or other materials which contain ultraviolet light excitable blue wavelength emitting substances. An electronic circuit for operating the reflectometer is also disclosed which employs a negative feedback circuit for maintaining the intensity of the ultraviolet light source at a relatively constant level.
Abstract:
An optoelectronic device is provided which permits rapid sequential measurement of the optical density of multiple samples. The device employs a plurality of light-emitting diodes (LEDs) as light sources and a plurality of photodiodes as light detectors. In a preferred embodiment, arrays of LEDs paired with photodiodes are adapted to measure the optical density of samples contained in multiwell plastic plates (microplates) conventionally used for immunoassays.