Abstract:
Local sensitive force detector output data, acquired from a cellular and sub-cellular structures (“biological structures”), are quantified in an objective format. Data are acquired from two axes of the biological structure at scan positions along a third axis of the biological structure, which is perpendicular to the two axes. Data are then quantified as a function of scan position along the third axis. The quantified data can be plotted and displayed to generate a two-dimensional representation of a biological structure's morphology, which contains quantified data points from along the third axis of the biological structure. The output can be used for morphology-based classification and typing of biological structures. The invention classifies and types biological structures by converting the local sensitive force detector data into a graphical fingerprint, which, for example, can be compared to standard data generated from known biological structures. Potential applications of the invention include (1) differentiating cells, such as malignant, premalignant, and benign cells in Pap smears, (2) typing cells into blood cell types, such as T-lymphocytes, B-lymphocytes, platelets, and red blood cells, and (3) identifying genetic variants among a group of macromolecules. Sub-cellular applications include classification of sperm nuclei. Advantages over and differences from previous methods include providing (1) data having higher resolution than confocal microscope data and (2) a measurement of biological structure's morphology as a function of scan position along a single axis, and (3) a method for objectively comparing the higher resolution data obtained from unknown biological structures to known biological structures.
Abstract:
The invention concerns a method and device for determining the direction of an object (10) which emits or reflects optical radiation. An optical element (14) which structures the wavefront of the radiation converts the conventional dot-type image (20) into an intensity distribution (14′) with more than one maximum on a locally resolving opto-electronic detector (13). From the intensity distribution (14′) and the structure function of the optical element (14), the direction of the object (10) can be determined with a high degree of accuracy over a wide measurement range. In addition, this gives a design with a shorter optical path length and very few optical components.
Abstract:
An image forming apparatus includes a plurality of light sources emitting beams of light, a photoconductor, a scanner for reflecting the beams of light emitted by the light sources to scan the photoconductor periodically, a light detector for receiving the beams of light from the scanner to determine a beam pitch between the beams of light, the light detector being provided in a part of an optical path between the scanner and the photoconductor, a beam shifter for shifting the beams of light incident on the scanner from the light sources, and a controller for operating the beam shifter so that the beam pitch determined by the light detector becomes a predetermined value.
Abstract:
A photodiode has integrated shields for the rejection of noise-producing electromagnetic interference and ambient light. The electromagnetic shield forms a conductive matrix which covers the photodiode active area. The matrix is deposited as a metallization layer onto the photodiode and provides exposed portions of the active area for light detection. A pad is electrically connected to the shield to allow external termination of the shield. The ambient-light shield is in the form of a colored encapsulant surrounding the photodiode. The encapsulant provides a high-pass light transmission characteristic which passes signal light and rejects out-of-band ambient light. The photodiode is particularly advantageous for use in pulse oximetry probes.
Abstract:
An optical scanning device includes a first optical system, including a light source, for directing a light beam, emitted from the light source, to an optical deflector. A second optical system focuses the light beam deflected by the deflector on an effective scanning area of a scanning surface. The light source is continuously kept lit when scanning outside of the effective scanning area. A light shield member is positioned between the deflector and the scanning surface to block at least a portion of the light beam emitted during the period of time when the light source is continuously kept lit when scanning outside of the effective scanning area.
Abstract:
A chemical sensing system and method. The system (10) includes a transmitter having a laser for providing a collimated beam of electromagnetic energy at a first frequency and a Q switch in optical alignment with the beam. The system further includes a crystal for shifting the frequency of the beam from the first frequency to a second frequency. A mechanism is included for shifting the beam from the second frequency to a third frequency in the range of 8-12 microns. The system includes a mechanism for switching the polarization state of the second beam and providing third and fourth beams therefrom. The third beam has a first polarization and the fourth beam has a second polarization. The second polarization is orthogonal relative to the first polarization. The frequency shifted third and fourth beams are combined to provide an output beam in the range of 8-12 microns. The output beam is transmitted and a return signal is detected by a receiver in the illustrative chemical sensing application.
Abstract:
An f-&thgr; lens is composed of a negative lens element of a negative power, and second and third lens elements of a positive power, arranged in this order from the side of a optical deflection device, wherein at least one surface of the lens elements is a cylindrical surface that has a refractive power only in the deflecting direction. The f-&thgr; lens satisfies the conditions: N1>N2=N3, v1>v2=v3, and 4 mm≦|f23/f1·D0|
Abstract:
An image projector of the present invention which is capable of automatically adjusting a size of an image area and a focal distance has light sources with a device for modulating light for forming an image, a measuring light source for supplying measuring light, a mixing optical system for mixing the light for forming an image and the measuring light on one optical axis, a projection device for scanning the light mixed by the mixing optical system and projecting the mixed light onto a screen, a photodetector for detecting the measuring light reflected by the screen, and correction devices for correcting an image by controlling the projected light on the basis of a result of detection by the photodetector.
Abstract:
New and improved scanning device and corresponding method that include and involve a movable stage on which a specimen is positioned, irradiation means which irradiates an electron beam onto an irradiation region of the specimen, secondary beam detection means used in generating a picture of the irradiation region by detecting a secondary beam which consists of at least one of secondary electrons or reflected electrons from the irradiation region of the electron beam, an imaging electron optical system which causes imaging of the secondary beam on a detection surface of the secondary beam detection means, and which is arranged between the specimen and the secondary beam detection means. The secondary beam detection means is equipped with a fluorescent unit which is arranged on the detection surface, and which converts the secondary beam into light, and one-dimensional line sensors which have a structure arrayed in two dimensions forming electric charge by photoelectric conversion, an array imaging element which continuously adds up the electric charge of the accumulated image in a predetermined line of the line sensors, and the electric charge of the line of the image which moves accompanying the movement of the stage, and a two-dimensional imaging element which emits electric charge by means of photoelectric conversion. The scanning device and corresponding method further include and involve changeover means for selectively irradiating the light converted by means of the fluorescent unit to an imaging element which is either one of the array imaging elements and the two-dimensional imaging element.
Abstract:
A scan module and an optical system such as for a bar code scanner wherein the optical system has an axis of outgoing (illumination) light offset from the axis of collected light, arranged to limit the dynamic range of the collected light and thus the dynamic range within which the bar code scanner detector and signal processor must function. Preferably, the outgoing axis and the collection lens axis are substantially parallel.