A liquid crystal driver, scanning control system and control method of the system
A liquid crystal driver and liquid crystal technology, applied in the field of liquid crystal filter waveband scanning control system and liquid crystal driver, can solve the problems of low accuracy, slow response speed, low stability, etc., and achieve the effect of improving voltage output resolution
Inactive Publication Date: 2020-06-19
NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI
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Problems solved by technology
However, the number of control channels of the liquid crystal driver of the existing optical filter is small, and it is impossible to realize high-precision synchronous control of multiple liquid crystal wave plates
Moreover, the existing liquid crystal driver has low precision, low stability, slow response speed and high cost
Method used
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Embodiment 1
[0069] Such as figure 2As shown, when the user controls the voltage across multiple liquid crystal wave plates in the liquid crystal filter through the user interface of the computer terminal, first click the start icon, the scanning control system enters the initialization stage, and then attempts to establish a communication connection. If the communication connection cannot be established, the display screen will display the communication establishment failure error message; if the communication establishment is successful, it will start to cyclically detect the loading voltage value of the liquid crystal wave plate and the recognition of the user interface function control command at the same time.
[0070] When cyclically detecting the voltage value loaded on the liquid crystal wave plate, the user interface will display the voltage value. After the display is completed, it will inquire whether the user has issued an end program command. If the query result is "Yes", the ...
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The invention discloses a liquid crystal driver, a scanning control system and a control method of the system. The liquid crystal driver is used for synchronously controlling a plurality of liquid crystal wave plates in a multi-path way by an FPGA module and a DAC module, the FPGA module comprises an FPGA chip, a DAC driving circuit is arranged on the FPGA chip, the FPGA chip uses Verilog languageto achieve parallel control of the DAC driving circuit, the DAC module is driven by the DAC driving circuit, the DAC module employs an eight-path 24-bit digital simulation conversion chip, and the DAC module is used for synchronously controlling the plurality of liquid crystal wave plates by synchronously controlling voltages of two ends of the plurality of liquid crystal wave plates. By the liquid crystal driver, the plurality of liquid crystal wave plates in a liquid crystal filter can be synchronously controlled in a high accuracy way, so that a waveband scanning control system employing the liquid crystal driver has the advantages of high accuracy, high stability, rapid response speed and low cost.
Description
technical field [0001] The invention relates to the field of astronomical observation equipment, in particular to a liquid crystal driver, a liquid crystal type optical filter band scanning control system and a control method for the system. Background technique [0002] Currently, liquid crystals are mostly used in display devices. With the development of liquid crystal technology, liquid crystals are used as phase retarders for transmitting polarized light, and are gradually used in many fields, such as remote sensing polarization image measurement, laser modulation, etc. Tunable narrow-band birefringence filters are an important class of instruments in solar magnetic field observation telescopes. Tunable refers to changing the wavelength of light that the filter can transmit by adjusting the filter. Narrowband means that the filter transmission bandwidth is less than 0.1 Angstroms. The birefringence of liquid crystal changes according to the magnitude of the voltage ap...
Claims
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IPC IPC(8): G05B19/042
CPCG05B19/0423G05B2219/25314
Inventor 王刚
Owner NAT ASTRONOMICAL OBSERVATORIES CHINESE ACAD OF SCI