Design Of Grating Monochromator Based On STM32

In this paper,through the study of the optical dispersion principle and mechanical structure system,combined with the design of other schemes,a new type of high-precision grating monochromator control system for measuring monochromatic light is built.The control system not only realizes precise control of optical components,but also has high repeatability,and the reliability of measurement results is greatly improved.The system has four main features: 1.The feedback control structure is used,which greatly improves the accuracy,reduces the damage caused by the abnormal system,and enhances the robustness of the system.2.There are multiple communication control methods to make the system more compatible;3.Multi-slab cooperation works with the characteristics of low interference,easy operation and easy maintenance;4.The introduction of high-precision collection methods and chips can make the collection weaker signal of.The control system of the grating monochromator for high-precision measurement described in this article mainly uses STMicroelectronics’ cost-effective chip STM32F103C8T6 as the main control chip to perform feedback-type high-voltage control,high-precision motor control,and high-precision data acquisition.CAN communication performs board-level communication,which improves the reliability of the data and reduces the error rate of the data.A display screen is added to the instrument for simple information display,which provides convenience for users to grasp the approximate operating status of the instrument in real time.The USB-to-serial chip is used to connect the lower computer to the upper computer,the circuit is simple,and it avoids the difficulties brought by the development of the previous USB communication protocol to the system development.Using the TCP / IP protocol network port to connect to the upper computer improves the data transmission efficiency,internal differential signal transmission ensures long-distance transmission,and the anti-interference ability is also enhanced.The use of Bluetooth to connect the Android mobile phone terminal enhances the flexibility of the control system and the flexibility of data transfer,so that the control mode of the instrument is not so simple,and when an abnormality occurs in one of the control modes,it can be controlled in another way.The lower computer program is programmed in the Keil5 integrated environment through C language,so as to realize the control of other modules and data transmission.The upper computer program is carried out on the Windows Forms application platform in Microsoft Visual Studio 2012.The C # language is used to implement instruction sending and data receiving processing.This part of the program can be connected to the lower computer through the serial port,or it can be connected to the lower computer through the TCP / IP protocol;the programming of the Android mobile phone is implemented using the Java language on Android Studio 3.1.2,and the Bluetooth communication protocol is used to communicate with the lower computer.Connect and communicate to realize the function of giving instructions and receiving data.The specific implementation of the control system described in this article is to use a stepper motor to drive the linkage rod sinusoidally to drive the grating to rotate,thereby achieving light dispersion.At present,the control system is mainly suitable for a sine-type scanning grating monochromator.For a worm-type monochromator,the system needs to be modified.Under the control of this control system,the sinusoidal grating monochromator can run normally,and has good wavelength resolution and wavelength repeatability.This text has introduced this control system in detail.