17 results about "Photodetector" patented technology

The present invention provides a solid-state imaging device includes a substrate having a first surface and a second surface, light being incident on the second surface side; a wiring layer disposed on the first surface side; a photodetector formed in the substrate and including a first region of a first conductivity type; a transfer gate disposed on the first surface of the substrate and adjacent to the photodetector, the transfer gate transferring a signal charge accumulated in the photodetector; and at least one control gate disposed on the first surface of the substrate and superposed on the photodetector, the control gate controlling the potential of the photodetector in the vicinity of the first surface.

Techniques that provide cost effective optical fiber communication links for HDCP transmission systems and the like are provided. A single fiber for bidirectional communication is enabled, without wavelength selective unit to achieve the HDCP transmission. One embodiment of the present invention has a forward channel using a light source (e.g., VCSEL at about 850 nm) in the GHz modulation level (e.g., 1 GHz or greater), and a corresponding photodetector. The backward channel has a light source (e.g., LED at 630 nm) in the MHz modulation level (e.g., 10 MHz or less), and a corresponding photodetector. One application is for realizing a home entertainment system (e.g., DVD player and high definition television) that employs an HDCP-enabled communication link to transmit copy restricted digital content.

A data reproduction apparatus for reproducing recorded data from an optical disk by using a PRML detection method is disclosed that includes an optical head including a light source, an optical system having an objective lens for condensing light emitted from the light source to the optical disk, and a photodetector for receiving light reflected from the optical disk, a signal generation circuit for generating an RF signal from a signal output from the photodetector, a phase correction circuit for correcting phase distortion of the RF signal when the recorded data are recorded in recording marks arranged with a pitch less than a diffraction limit, a clock extraction circuit for extracting a clock from the corrected RF signal, and a decoding circuit for decoding the recorded data from the RF signal in synchronization with the clock extracted by the clock extraction circuit.

The present invention refers to photovoltaic type ultraviolet light decetor and preparation method with metal-semiconductor-metal structure (MSM) using nanocrystal TiO 2 thin-film material as basal body. It contains in turn from the bottom up: using sol-gel process on insulating substrate grown nanocrystal TiO 2 film, finger inserting metal electrode on nanocrystal TiO film prepared by vaporization or sputtering method. Said decetor preparation method is: first adopting sol-gel technology to grow single-layer uniform tight nanocrystal TiO 2 film on insulating substrate, then sputtering a layer metal on nanocrystal TiO 2 thin-film surface, finally utilizing standard photetch forming finger inserting electrode. Said invention prepared MSM constructional photovoltaic type ultraviolet light decetor possess very evident photoresponse to wavelength from 230 to 280 nm ultraviolet band.

In the optical pickup device, while reflection light reflected from the optical multi-layer disc is divided into a plurality of regions so as to produce a plurality of divided optical beams, the divided optical beams are focused onto different positions on a photodetector, and a focus error signal is detected by employing a plurality of the divided optical beams by utilizing the knife edge method, and further, a tracking error signal is detected by employing a plurality of the divided optical beams. Furthermore, the dividing regions of the optical beam and light receiving parts are arranged in such a manner that stray light derived from other layers of the optical disc is not entered to a servo signal-purpose light receiving part of the photodetector when the divided optical beam is focused onto a target layer of the optical disc.

In an optical pickup device, an optical reflection beam from a multi-layer optical disc is divided into a plurality of areas, divided optical fluxes focus upon different positions on a photodetector, a focusing error signal is detected by using a plurality of divided optical fluxes by a knife edge method, and a tracking error signal is detected by using a plurality of divided optical fluxes. The optical flux divided areas and light receiving parts are disposed in such a manner that in an in-focus state of a target layer, stray light from another layer does not enter servo signal light receiving parts of the photodetector. It is therefore possible to obtain stable servo signals including both the focusing error signal and tracking error signal during recording/reproducing a multi-layer optical disc, without being influenced by stray light from another layer.

The invention discloses a self-mixing coherent laser radar invasive blood sugar measuring system, which comprises a tunable semiconductor laser, a photodetector, a signal processing circuit and the like. The photodetector is arranged on the rear end face of the laser or arranged in parallel with the laser; and the signal processing circuit is connected with the photodetector. The mode-hopping-free tunable semiconductor laser replaces a movable mechanical arm, the mechanical precision requirement of the system is reduced, and the system is miniaturized and portable; and the system is further simplified by a self-mixing coherent method, signals are amplified, and weak signals can be detected through simple elements and structures.

The invention relates to a forest dead combustible moisture online measuring device and a measuring method thereof. The device comprises a mounting bracket; a half-transparent and half-reflecting mirror is arranged in the middle of the mounting bracket; a laser is arranged at the right side of the half-transparent and half-reflecting mirror in an inclined way; along a light source transmission path, the light emitted by the laser is projected onto a standard Lambert plate after passing through the half-transparent and half-reflecting mirror by means of transmission, and is then projected onto a photodetector I by means of reflection of the standard Lambert plate; along a light source reflection path, a light source emitted by the laser is projected onto a dead combustible container after passing through the half-transparent and half-reflecting mirror, and is then projected onto a photodetector II by means of reflection of the dead combustible container; the photodetector I and the photodetector II are also separately connected with a set of data processing device. The forest dead combustible moisture online measuring device can be used for substituting manual work in the open air for performing real-time monitoring for 24h; the online measuring device adopts an LORA wireless technology, can be used for postback data from a long distance with low energy consumption, and also can ensure the integrity of the data in a transmission process.

Techniques are disclosed for aligning a first optical scope with a second optical scope to achieve a line-of-sight communication link between the two optical scopes. In an example embodiment, each scope can include an optical transceiver and camera. The optical transceiver in the first optical scope can include a light array that is used to emit a bright pulse of light as a flash. The camera in the second optical scope captures this flash in a camera image. The camera image can then be processed to spatially localize the flash relative to a central region of a photodetector array in the optical transceiver of the second optical scope. A control system can then drive a positioning system for the second optical scope to adjust the second optical scope's positioning so that the second optical scope photodetector array's central region aligns with the spatially localized flash.

The invention relates to the field of graphene photodetectors, in particular to a PIN structure graphene photodetector with adjustable Fermi level and a preparation method thereof; the PIN structure graphene photodetector with adjustable Fermi level comprises a substrate, a metal layer, an insulating layer, a P-doped graphene layer, a dielectric layer and an N-doped graphene layer sequentially from bottom to top; gate voltage is applied to the metal layer; the insulating layer has a source electrode, a drain electrode and a first electrode, and the source electrode and the drain electrode are arranged on two sides of the first graphene layer respectively and are both connected to the first graphene layer; the first electrode and the second electrode are arranged on two sides of the second graphene layer respectively, and the first electrode is connected to the second graphene layer; the P-doped graphene layer, the dielectric layer and the N-doped graphene layer form a PIN structure; the first graphene layer, the source electrode, the drain electrode, the insulating layer and the metal layer form a field-effect transistor. The field-effect transistor made with graphene material is combined with the PIN structure to form the photodetector, providing high-response quick detection under ultraviolet-to-infrared broad band.

A multichannel polarization stabilizer including a mixing device responsive to a sample beam and a reference beam that provides an in-phase signal including the mixed sample beam and reference beam having a relative phase of 0° and a quadrature phase signal including the mixed sample beam and reference beam having a relative phase of 90°. The stabilizer also includes a photodetector responsive to the quadrature phase signal that converts the quadrature phase signal to a quadrature phase electrical signal. A polarization demultiplexer circuit receives the quadrature phase electrical signal and measures the amplitude of a frequency tone in the sample beam and provides a polarization amplitude signal. A polarization controller receives the polarization amplitude signal and controls the reference beam to maximize the polarization amplitude signal.

The invention provides a gesture sensing module and method as well as an electronic apparatus. The gesture sensing module is arranged on a substrate and comprises at least one luminous unit, at least one light sensor and a control circuit. The luminous unit is used for providing a light beam to irradiate a sensing region, wherein a central optical axis of the light beam and a normal vector of the substrate form an included angle, and the included angle is not equal to zero. The light sensor is used for sensing reflected light of a reflected light beam of a target object in the sensing region and generating a sensing signal according to the reflected light. The control circuit is coupled to the light sensor and the luminous unit, and judges a proceeding direction of the target object according to the sensing signal.