10 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 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.

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.

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 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.