Starting from Fourier transform, the analytical solution of Gaussian beam diffraction by circular aperture is derived and compared with the result of parallel light under the same conditions. The light intensity distribution curves of the two conditions are plotted by computer numerical calculation. By comparison, it is found that when the circular aperture radius a2<
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Overview of FPGA Device Design Technology Development
As a programmable logic device, Field Programmable Gate Array (FPGA) has gradually evolved from a peripheral device of electronic design to the core of digital systems in just over 20 years, and has been widely used in many fields such as computer hardware, communications, aerospace, and automotive electronics. With the advancement of semiconductor process technology, the design technology of FPGA devices has made a leap forward. While reviewing the development history of FPGA, this article summarizes the cutting-edge technology of current mainstream FPGA devices and looks forward to the development prospects of the new generation of FPGA.
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Conductive polymer aluminum solid electrolytic capacitor
Conductive polymer aluminum solid electrolytic capacitor
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DRV602,pdf(DIRECTPATH™, Pop-Free 3VRMS Line Driver)
DRV602,pdf(DIRECTPATH™, Pop-Free 3VRMS Line Driver)
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The Development Trend of Measurement Technology and Instruments in the 21st Century
Measurement technology and instruments involve the measurement of all physical quantities and are closely related to materials, engineering science, and energy science. The current development trends are as follows: (1) Traceability and transfer based on natural benchmarks, while achieving international comparisons at different ranges. If you do not have the ability to compare, you must rely on other countries.
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Skyworth 4A01 (TA8759BN) color TV circuit diagram
Skyworth 4A01 (TA8759BN) color TV circuit diagram
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Working principle of pressure transmitter
Working principle of pressure transmitter The two pressures of the measured medium of the pressure transmitter are passed into the high and low pressure chambers, acting on the isolation diaphragms on both sides of the delta element (i.e., sensitive element), and transmitted to both sides of the measuring diaphragm through the isolation diaphragms and the filling liquid in the element. The measuring diaphragm and the electrodes on the insulating sheets on both sides each form a capacitor. When the pressures on both sides are inconsistent, the measuring diaphragm is displaced, and the displacement is proportional to the pressure difference, so the capacitance on both sides is not equal. Through the oscillation and demodulation links, it is converted into a signal proportional to the pressure. The working principle of the pressure transmitter and the absolute pressure transmitter is the same as that of the differential pressure transmitter, except that the pressure in the low pressure chamber is atmospheric pressure or vacuum. The A/D converter converts the current of the demodulator into a digital signal, and its value is used by the microprocessor to determine the input pressure value. The microprocessor controls the operation of the transmitter. In addition, it performs sensor linearization. Reset the measurement range. Engineering unit conversion, damping, square root, sensor fine-tuning and other operations, as well as diagnosis and digital communication. The microprocessor has 16 bytes of program RAM and three 16-bit counters, one of which performs A/D conversion. The D/A converter fine-tunes the data from the corrected digital signal from the microprocessor, which can be modified by the transmitter software. The data is stored in the EEPROM and is kept intact even if the power is off. The digital communication line provides the transmitter with an interface to external devices (such as the 275 type intelligent communicator or a control system using the HART protocol). This line detects the digital signal superimposed on the 4-20mA signal and transmits the required information through the loop. The type of communication is frequency shift keyed FSK technology and is based on the BeII202 standard.
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electronic