Abstract:
This invention concerns a fluorometer preferably combined with a thermal cycler useful in biochemical protocols such as polymerase chain reaction (PCR) and DNA melting curve analysis. The present flourometer features a low heat-generating light source such as a light emitting diode (LED), having a one-to-one correspondence to each of a plurality of sample containers, such as capped PCR tubes in a standard titer tray. The flourometer of the present invention further comprises an optical path between each LED and its correspondingly positioned container, and another optical path between each flourescing sample within the positioned container and an optical signal sensing means. The instrument can be computer controlled.
Abstract:
A positioning apparatus for positioning a point on a cylindrical member having a small diameter, such as an optical fiber, along a predetermined reference axis regardless of the outer diameter of the fiber.
Abstract:
A switch for controlling the transmission of light from a first optical fiber to at least a second optical fiber or from a single bidirectional optical fiber back to itself includes a housing having a spherical concave reflector mounted therewithin. Fiber mounting means is provided for mounting optical fiber(s) at a predetermined location within the housing such that at least a portion of a beam of light emanating from the end face of one fiber propagates along an incidence path toward the reflector from which it is reflected by the curved concave reflector along a predetermined reflectance path. A light interrupter is mounted within the housing for switchable movement between a light transmissive state and a light interruptive state. A light absorbing member is positioned such that residual light reflected from the light interrupter is directed toward and absorbed by the light absorbing member. A switch presence indicator for providing an indication that the light interrupter is disposed in the interdiction position may also be included.
Abstract:
A control system for controlling the velocity of a member in a printing system which utilizes a signal representative of the time variation in intensity produced by the Doppler shift between radiation reflected from the moving member and a reference signal to generate a control signal for correcting the velocity of the moving member. The control signal is applied to a servo mechanism to modify the velocity of the moving member in the appropriate manner.
Abstract:
An improved spectrophotometer having a light source, a scanning type monochromator that provides light beams of different wavelengths over a light spectrum being scanned, and an object photometer for measuring the intensity of reflected light from an object being tested and generating an electrical signal proportional to the intensity of the light measured and connected to means for recording the signal as a function of wavelength measured, the improvement used therewith comprising:(a) a beam splitter that divides the beam exiting from the monochromator into first and second light beams, whereby the first beam is incident upon the object;(b) a reference photometer that measures the flux of the second light beam and generates an output electrical signal proportional to the intensity of the light measured; and(c) a light source control, connecting the reference photometer and the light source, which receives the electrical signal from the reference photometer and generates a feedback electrical signal to adjust the intensity of the light source to maintain the reference photometer output electrical signal level constant across the light spectrum that is being scanned.The spectrophotometer is useful for determining standard color values for coatings on substrates or for any colored surface.
Abstract:
This invention concerns a fluorometer preferably combined with a thermal cycler useful in biochemical protocols such as polymerase chain reaction (PCR) and DNA melting curve analysis. The present fluorometer features a low heat-generating light source such as a light emitting diode (LED), having a one-to-one correspondence to each of a plurality of sample containers, such as capped PCR tubes in a standard titer tray. The fluorometer of the present invention further comprises an optical path between each LED and its to correspondingly positioned container, and another optical path between each fluorescing sample within the positioned container and an optical signal sensing means. The instrument can be computer controlled.
Abstract:
This invention concerns a fluorometer preferably combined with a thermal cycler useful in biochemical protocols such as polymerase chain reaction (PCR) and DNA melting curve analysis. The present fluorometer features a low heat-generating light source such as a light emitting diode (LED), having a one-to-one correspondence to each of a plurality of sample containers, such as capped PCR tubes in a standard titer tray. The fluorometer of the present invention further comprises an optical path between each LED and its correspondingly positioned container, and another optical path between each fluorescing sample within the positioned container and an optical signal sensing means. The instrument can be computer controlled.
Abstract:
An optical fiber switch in which the switching force is applied directly to the fiber. A biasing force, generated by a bending of the fiber, is exerted on the fiber in a direction tending to urge the same toward the bottom of a first groove. The switching force is applied transversely to the direction of the biasing force, and moves the fiber out of the first groove and into a second, adjacent groove. When in the second groove, the biasing force on the fiber urges the same toward the bottom of the second groove.
Abstract:
A fiber optic switch has a fixed member and a movable member mounted for cantilevered movement with respect thereto. Both of the members are fabricated from borosilicate glass.
Abstract:
A circular scan reader utilizes oscillating mirrors and associated optics to generate a circular scan pattern of laser light focused to a small spot. The angle of the scan emanating from a point just inside the reader through a window forms a conical shape which permits scanning inside a yarn tube without inserting any portion of the reader into the tube. When the scan passes over a bar coded label, the changes in reflection of light between the bars and spaces are detected by a photodetector mounted on the face of the window. These fluctuations in light which correspond in width to the bar and space width are converted to an electrical signal that is amplified, and decoded. A driver circuit for the oscillating mirrors controls the scan rate and scan pattern. The scan rate is modulated to cause a variation in the sweep depth in the tube thus providing an area scan. The area scan reduces the need for accurate label placement in the tube core.