17 results about "Diode detectors" patented technology

The invention provides a combined type electronic detector, electronic detection equipment and a detection method, and belongs to the technical field of electronic microscopic imaging. The combined type electronic detector adopts a structure that yttrium aluminum garnet crystals are arranged to partially cover a split type silicon diode detector, so that physical replacement of any detection body is not needed, and the detection efficiency is improved. According to the invention, signals of different areas can be selected and read through an electronic mode, so that an optimal detection mode is called under different working conditions, detection can be realized under the condition of high acceleration voltage, detection can also be realized under the condition of low acceleration voltage, one machine with two purposes is realized, and the performance and the application range of electron beam equipment are greatly improved.

The invention relates to an infrared imager, and relates to the technical field of infrared detection, and the infrared imager is provided with an isolation resistor to reduce the influence of crosstalk. The infrared imager comprises a substrate and a plurality of detection units, wherein the plurality of detection units are arranged on one side of the substrate in an array; each detection unit comprises a thin film transistor, a diode detector and an isolation resistor; the thin film transistor at least comprises a control end and a first end, the diode detector is connected between the control end and the first end of the thin film transistor, and the isolation resistor is connected in parallel with the diode detector; the thin film transistor and the diode detector are switched on when receiving the first bias voltage and switched off when receiving the second bias voltage; the isolation resistor is used for eliminating leakage current among the plurality of diode detectors.

The invention provides a laser radar ranging method and system using a single photon avalanche diode. A laser radar range finding method using a single photon avalanche diode comprises the following steps: generating and emitting a laser pulse sequence, the laser pulse sequence comprising a plurality of pulses, the plurality of pulses having a plurality of time intervals, each time interval being an integral multiple of the resolution of a time-to-digital converter, the sum of all the time intervals is a preset fixed value, so that the duration of a single measurement period is fixed; receiving an echo signal reflected by a target by using a single photon avalanche diode detector, and quantizing the echo signal into a receiving vector by using a time-to-digital converter; and performing cross-correlation operation on the receiving vector and a transmitting vector corresponding to the laser pulse sequence, and calculating a target distance according to a peak value position of a cross-correlation operation result. According to the invention, hardware cost is reduced, and high-efficiency ranging with a stable frame rate is realized at the same time.

The invention relates to the technical field of optical communication, in particular to a pump laser. The pump laser comprises a substrate, a pump laser chip, a monitoring diode detector and an optical fiber cushion block, the pump laser chip, the monitoring diode detector and the optical fiber cushion block are arranged on the substrate, the optical fiber cushion block is located at the optical signal output end of the pump laser chip, and the monitoring diode detector is located at the backlight output end of the pump laser chip; an optical fiber is arranged on the optical fiber cushion block in a penetrating mode, and the optical fiber cushion block is used for enabling the end of the optical fiber to be coupled with the optical signal output end of the pump laser chip. By adopting the above mode, miniaturization and integration of the pump laser can be realized.

The invention relates to a single photon avalanche diode detector and a preparation method thereof. The method comprises the following steps: after a deep groove between every two adjacent single-photon avalanche diode units of the single-photon avalanche diode unit array is etched, sequentially growing a first buffer layer, a hafnium oxide layer, an aluminum oxide layer, a tantalum oxide layer, a second buffer layer and an adhesion layer on the surface of the deep groove; and filling the deep trench with a metal layer for surface planarization to obtain the single-photon avalanche diode detector. According to the invention, the ion concentration of metal ions diffused to the working area of the device can be effectively reduced, the possibility of wrong time and distance information feedback of pixels caused by ion pollution is improved, and the imaging quality and the production and manufacturing yield are further effectively improved.

The utility model discloses a positioning structure used for a diode detector, comprising a diode detector, the top of the diode detector is fixedly provided with a fixing plate, the inside of the fixing plate is rotatably connected with a screw rod, the right end of the screw rod is fixedly provided with a rotating disc, the right side of the rotating disc is provided with an elastic assembly, and the elastic assembly is provided with a positioning pin. A limiting rod is arranged in the rotating disc through an elastic assembly and slidably connected with the rotating disc, a limiting groove is formed in the right side of the fixing plate, a moving block is in threaded connection with the surface of the screw rod, a guide rod is slidably connected into the moving block, and the guide rod is fixedly connected with the fixing plate. And a fixing sleeve is fixedly mounted at the top of the moving block, a conductive assembly is arranged in the fixing sleeve, and a clamping assembly is arranged in the fixing sleeve. The purpose that the distance between the fixing sleeves can be adjusted according to the sizes of the diodes is achieved, and the detector can conveniently position and clamp the diodes of different sizes.

The application discloses a kind of shipborne marine aerosol monitoring platform device and use method, platform device includes ship body, monitoring cavity is equipped on the deck of ship body, the outlet end of gas inlet pipe is vertically extended from the top end of monitoring cavity into monitoring cavity, laser diode is fixed in the right part of monitoring cavity, probe diode is fixed in the upper part of monitoring cavity and scattering mirror is fixed in the lower part, laser diode is used to emit laser to aerosol particle in air sample, scattering mirror is used to reflect the scattering light emitted by aerosol particle under the action of laser to probe diode, probe diode is used to receive scattering light and convert into electric pulse, and the number of aerosol particles in certain particle size section in air sample in monitoring cavity in certain time period is calculated.The application can obtain the number concentration of aerosol particles in open sea moving air source, and the spatial resolution of monitored aerosol particle number concentration is higher.

This invention provides a lidar ranging method and system using a single-photon avalanche diode (SPAD). The lidar ranging method using a SPAD includes the following steps: generating and transmitting a laser pulse sequence, the laser pulse sequence containing *n* pulses, with *n* time intervals between the *n* pulses, wherein each time interval is an integer multiple of the resolution of the time-to-digital converter (TD-SCDMA), and the sum of all time intervals is a preset constant value to fix the duration of a single measurement cycle; receiving the echo signal reflected from the target using a SPAD detector, and quantizing the echo signal into a received vector using the TD-SCDMA; performing a cross-correlation operation between the received vector and the corresponding transmitted vector of the laser pulse sequence, and calculating the target distance based on the peak position of the cross-correlation result. This invention achieves high-efficiency ranging with a stable frame rate while reducing hardware costs.

The invention discloses a communication and remote sensing integrated forest fire prevention laser radar system and a use method thereof. The laser radar comprises a continuous light laser, a beam splitter, an analog signal generator, an electro-optical modulator, a pulse optical fiber amplifier, a circulator, a variable-focus transceiver telescope, a coupler, an acousto-optic frequency shifter, a balance detector, a receiving telescope, an avalanche diode detector, a multi-channel data acquisition system and a computer. According to the invention, the electro-optical modulator is adopted to modulate a high-frequency pulse signal, and an atmospheric detection signal and a communication signal can be generated; signal frequency shift is realized by adopting an acousto-optic frequency shifter, and wind field direction information is obtained; a variable-focus transceiving telescope, a receiving telescope and laser radars are adopted for networking, and optical information transmission between the laser radars is achieved. The system can realize information communication of the laser radar in a non-signal area, and is especially suitable for being applied to the field of forest fire prevention based on the advantages of multi-parameter detection, high resolution and wide coverage of the laser radar.

The invention provides a method for regulating the responsivity of a quantum dot photodiode detector. By establishing a formula model between the responsivity and structural parameters of the quantum dot photodiode detector, efficient prediction and accurate regulation and control of the responsivity of the detector are realized. After the model is established, multiple responsivity tests are carried out on the detector with initial structure parameters, model structure coefficients are fitted in combination with actually measured data, and a responsivity model suitable for a target device is obtained. And on the basis, discretization valuing and enumeration calculation are carried out on the structure parameters under the constraint of a preset parameter valuing range and a valuing increment, a parameter combination enabling the calculation responsivity to be closest to the target responsivity is screened out, and the device structure or the preparation process is optimized according to the parameter combination. The method can be automatically executed by a computer, and has the advantages of clear parameters, strong calculation realizability and high prediction precision.

The present invention provides a near-infrared moisture meter based on three LED lamps, wherein a photodiode detector is located at the focus of a plano-concave focusing lens and is placed on one side of an object to be measured and forms an acute angle with a vertical line. The three LED lamps are arranged in an equilateral triangle and are located behind a biconvex focusing lens, the center of the equilateral triangle is located on the central optical axis of the biconvex focusing lens, one of the three LED lamps is a measuring light source, and the other two are reference light sources. The wavelengths of all the light sources are different, and the light sources as a whole are located on the other side of the object to be measured and are symmetrical with the photodiode detector about the vertical line. A host computer controls a driving circuit to output three control signals with the same frequency, the same duty cycle, a phase difference of 120 degrees, and real-time adjustable phase amplitude to respectively control the three LEDs to light up alternately. The three LED lamps respectively emit light that passes through the biconvex focusing lens and is incident on the object to be measured. After diffuse reflection by the object to be measured, the light is converged by the plano-concave focusing lens and is then irradiated on the photodiode detector. The output end of the photodiode detector is connected to the input end of a preamplifier circuit, and the output end of the preamplifier circuit is connected to the host computer. The three LED lamps of the present invention are irradiated after being expanded and focused, and the emitted light rays are approximately combined into a parallel beam, so that the light source detection surfaces basically overlap, the light spot coverage range is large, and the measurement accuracy is high. The three-way LED lamps compensate each other through two sets of comparison results of one beam of measurement light and two beams of reference light, which can effectively eliminate the influence of uncontrollable factors such as color difference and particle size difference.

This invention discloses a millimeter-wave power monitoring and compensation method and system for ECRH systems, belonging to the field of magnetic confinement nuclear fusion plasma heating and microwave measurement technology. The invention constructs an offline training dataset with time delay alignment under energy integral constraints to train a millimeter-wave power thermal drift compensation model with detector voltage and detector temperature as inputs. After quantizing the model into a low-bit model, it is deployed on an edge control platform, forming a dual-rate compensation architecture of "slow-loop inference - fast-loop execution": the slow loop periodically infers dynamic compensation coefficients, and the fast loop uses these coefficients to perform real-time linear compensation of the high-speed detector voltage and execute microsecond-level interlocking protection. This invention combines the high-speed response of diode detectors with the high precision of calorimetry, enabling high-precision, low-delay, and highly robust power monitoring and interlocking protection under long-pulse, high-power conditions, significantly improving the safety of fusion device operation and the accuracy of physical analysis.

The utility model discloses a ray energy spectrum acquisition circuit applied to fluorescence reflection. The ray energy spectrum acquisition circuit comprises a refrigeration control circuit, a photodiode detector, a charge sensitive pre-amplification circuit, a second-order active filtering amplification circuit and a multichannel pulse amplitude analysis circuit, wherein the refrigeration control circuit is connected with a refrigerator arranged in the photodiode detector and is used for adjusting the low temperature of an inner cavity of the photodiode detector; the output end of the photodiode detector is connected with the input end of the charge sensitive pre-amplification circuit, and the output end of the charge sensitive pre-amplification circuit is connected with the input end of the second-order active filtering amplification circuit. And the output end of the second-order active filtering and amplifying circuit is connected with the input end of the multi-channel pulse amplitude analysis circuit. According to the utility model, weak signals collected by the photodiode detector can be rapidly collected and processed by using a fluorescence reflection method, and accurate energy spectrum data can be obtained.

The invention discloses an X-ray automatic focusing method based on a semi-focusing multi-capillary lens. According to the invention, a plurality of single-axis precision displacement tables are combined to form a four-dimensional adjusting structure, the real-time signal acquisition and feedback functions of a diode detector are combined, and the lower machine position is controlled by using Labview control software in the upper machine position, so that the automatic focusing positioning of the semi-focusing multi-capillary lens is realized. According to the method, accurate adjustment of the capillary lens is achieved through dynamic circulation of signal detection, data calculation and position correction, and in a medium-energy X-ray focusing signal feedback scene, a high-performance signal feedback element such as a diode detector can be adopted for real-time judgment of the focusing state. The moving direction and the step length of the displacement table are dynamically controlled based on the signal analysis result, automatic and accurate focusing of the capillary lens is achieved, the problem of insufficient focusing can be effectively solved, the operation steps are simplified, and the adjusting time is shortened.

The objective of the utility model is to provide a waveguide power meter probe, comprising a waveguide radio frequency input port and a casing, the left end of the inner wall of the casing is provided with the waveguide radio frequency input port, the right end of the inner wall of the waveguide radio frequency input port is provided with an aviation plug, a diode detector is clamped in the casing, and the waveguide radio frequency input port is connected with the waveguide radio frequency input port. An MCU data acquisition board is fixedly connected inside the casing, a waveguide radio frequency input port of the waveguide power meter is used for receiving a measured signal, the measured signal outputs voltage through a diode detector, the output of the diode detector is connected with the MCU data acquisition board, and a numerical value is monitored and recorded through the voltage received by the data acquisition board. And the detection value is transmitted to the upper computer software of the display terminal through the aviation plug connector for calibration and checking. The device has the advantages of being good in impedance matching, simple in structure, convenient to manufacture, easy to operate and carry and the like, and is suitable for accurate power measurement of high-frequency-band microwave signals.

The present disclosure provides a radiation imaging system and method, and relates to the technical field of radiation detection. The radiation imaging system of the present disclosure comprises: a photodiode detector configured to receive rays from a ray source and generate a first detection signal; a first imaging device connected with the photodiode detector and configured to generate first imaging data according to the first detection signal; a counting detector located on the side of the photodiode detector away from the ray receiving surface and configured to receive rays passing through the photodiode detector and generate a second detection signal; a counting imaging device connected with the counting detector and configured to generate counting imaging data according to the second detection signal; and an image fusion device configured to obtain a first fused image according to the first imaging data and the counting imaging data, thereby improving the radiation detection quality.

A diode detector with a large dynamic range and high sensitivity comprises forward and reverse multistage diode units which are connected with a radio frequency input port J1. The video resistor R4 and the multi-stage forward detection voltage amplification unit are connected with the forward multi-stage diode unit; the video resistor R5 and the multi-stage reverse detection voltage amplification unit are connected with the reverse multi-stage diode unit; the forward / reverse multistage diode unit comprises a plurality of forward / reverse serial detector diodes; each of the multi-stage forward detection voltage amplification unit and the multi-stage reverse detection voltage amplification unit comprises a plurality of detection voltage amplification circuits which are connected in series, voltage dividing units are arranged between adjacent detection voltage amplification circuits of the multi-stage forward detection voltage amplification unit and the multi-stage reverse detection voltage amplification unit, and whether the voltage dividing units work or not is controlled through switches. And the amplification factor of the amplification unit is adjusted. A bidirectional multi-tube diode detection scheme is used, and meanwhile, an adjustable gain voltage amplification circuit is ingeniously and flexibly applied, so that the detection dynamic range is expanded, and the detection sensitivity is improved.