89 results about "Diode detectors" patented technology

The invention relates to a manufacturing method of a flat-type avalanche diode detector used for detecting a single photon. The manufacturing method comprises the following steps: sequentially growing an InP buffer layer, an InGaAs absorbing layer, an InGaAsP gradient layer, an N-type InP charge layer and an InP cap layer on an N-type InP substrate; growing an SiO2 protective layer on the InP caplayer; photoengraving a round window at the middle of the SiO2 protective layer; eroding the InP cap layer in the round window through wet-method erosion, thereby forming a round hole; carving a protection ring window on the SiO2 protective layer around the round window; removing surplus SiO2 protective layer by utilizing an HF (hydrogen fluoride) solution in the protection ring window through a diffusion process; regrowing the InP cap layer an SiO2 layer, and caving an electrode window at the periphery of the round hole; forming a top ring electrode on the electrode window through an electron beam evaporation and desquamation process, and preparing a metal electrode at the periphery and one side of the ring electrode; and forming a back electrode at the back of the N-type InP substrate through electron beam evaporation, and preparing a SiNx antireflection layer at the surface of the InP cap layer in the round hole, thereby finishing the manufacture of the avalanche diode detector.

The present invention relates generally to methods and devices of generating an electrical representation of at least one object in a scene in the real word. The detail real-time imager for the representation of a scene of a real world comprises:—at least an illuminator (0501-0511) of said scene providing at least a series of ultra-short power laser pulses with time-related positions; and—a receiver (0515-0523) of a SPAD Single Photon Avalanche Diode detector array according to the method of the invention and associated to at least said series of ultra-short power laser pulses of said illuminator.

A diode detector comprising a detector network adapted to detect and multiply the detected voltage coupled to a divider network that comprise diodes in equal number to the number of diodes in the detector network, provides a passive detector applicable to any application requiring a small, efficient, high output, inexpensive temperature compensated detector for use as demodulator or as power to voltage converter. Integrating a portion of the divider network in the detector / multiplier network allows control over the minimum input impedance of the detector.

A contaminant detection machine (1) including a conveyor (3) which causes an object under inspection (79) to pass through a plane (48) of emitted x-ray radiation. The plane is generated by an x-ray tube (55) that emits a lateral beam, thereby permitting the distance (88) between the x-ray tube and the object under inspection to be reduced. A photo diode arch mounting assembly (104) is placed above the object under inspection and is mated to a collimator assembly (125) that also serves as the mounting bracket for the x-ray generation assembly (38), thereby preserving optical alignment between the photo diode detector array (28) and the emitted x-ray plane (48). The detector array (28) scans the object under inspection (79) so as to produce a continuous series of discrete lines, each line being analyzed by an image processing unit (116) to determine the presence or absence of a contaminant. The conveyor (3) passes over a pair of slider bed surfaces (155, 156) which are mounted in a hinged manner such that the leading edge (168) of one surface (156) is parallel to and spaced apart from the trailing edge (172) of the other surface (155), thereby creating a gap that is coplanar with the collimation slot (129) and the emitted x-ray plane (48). Each bed surface (155, 156) is rigidly constrained within open ended mounting brackets (159, 160, 161 and 162) yet can be removed by hand without the use of tools. Similarly, the conveyor (3) is supported by a roller assembly (182) that includes a tracking block (142) and pivot pin (143) which permits the roller assembly to be mounted to and removed from flip up mounts (151, 152) by hand and without the need of tools. Graphical user interfaces (249, 260, 261, 266, 275, 282 and 288) permit a user to operate the machine (1) by means of a liquid crystal display touch screen (20).

The invention provides an integrated high-sensitivity millimeter wave receiver for a millimeter wave array imaging system, which comprises a plate body with a hole body, an integrated RF circuit fixed on one side of the plate body, a power supply circuit fixed on the other side of the plate body, and two packaging cover bodies; the integrated RF circuit further comprises a plane micro strip slot antenna used to receive millimeter wave, a low-noise amplifier used to amplify the accessed millimeter wave, and a mixed and integrated diode detector used to convert the amplified millimeter wave into low-frequency voltage signals which are in direct proportion to the power; the power supply circuit is connected with the integrated RF circuit through the hole body, and is used to supply power to the RF circuit; and the two packaging cover bodies are used to clamp the plate body for packaging. The compact structure can effectively overcome large size, poor stability and other defects, greatly reduces the size and the weight of the millimeter wave receiver, improves the performance, the quality and the reliability of the complete machine, and is applicable to mass production, so as to meet the needs of the array millimeter wave imaging system.

A modulated backscatter radio frequency identification device includes a diode detector configured to selectively modulate a reply signal onto an incoming continuous wave; communications circuitry configured to provide a modulation control signal to the diode detector, the diode detector being configured to modulate the reply signal in response to be modulation control signal; and circuitry configured to increase impedance change at the diode detector which would otherwise not occur because the diode detector rectifies the incoming continuous wave while modulating the reply signal, whereby reducing the rectified signal increases modulation depth by removing the reverse bias effects on impedance changes. Methods of improving depth of modulation in a modulated backscatter radio frequency identification device are also provided.

The invention relates to the microwave technology and discloses a microwave temperature compensation detector. The microwave temperature compensation detector solves the problems that an existing diode detector is low in precision under different environment temperatures, is large in direct current drift of detection signal output and needs to repeatedly debug a compensation dosage. The difference between the microwave temperature compensation detector and the prior art is that the microwave temperature compensation detector uses a double-PN-junction detector diode instead of a detector diode, uses a temperature compensation network instead of a temperature compensation resistor and uses a double-differential operational amplifier module. The microwave temperature compensation detector has beneficial effects of small detector voltage temperature drift and small direct current temperature drift of output.

An amplitude flatness and phase linearity calibration method for an RF source across a wide frequency bandwidth uses a simple square law diode detector and at least a pair of equal amplitude frequency tones. A baseband generator for the RF source generates the tones, which are applied in series to a correction filter and an up-converter to produce an output RF signal. The tones are stepped across a specified frequency bandwidth, and at each average frequency for the tones a magnitude and group delay is measured as well as a phase for the beat frequency between the tones. The resulting measurements are used to calibrate filter coefficients for the correction filter to assure amplitude flatness and phase linearity across the specified frequency bandwidth.

A diode detector comprising a detector network adapted to detect and multiply the detected voltage coupled to a divider network that comprise diodes in equal number to the number of diodes in the detector network, provides a passive detector applicable to any application requiring a small, efficient, high output, inexpensive temperature compensated detector for use as demodulator or as power to voltage converter. Integrating a portion of the divider network in the detector / multiplier network allows control over the minimum input impedance of the detector.