Tobacco products HS code verification

List of the contents of this article:

• 1,Tobacco products HS code verification Design based on FPGA raster displacement measurement system
• 2, What are the logical components of the raster scanning graphics system
• 3, How does the grating measurement system determine the absolute zero line?
• 4, Briefly describe the raster system
• 5, Raster Digital Display Introduction of the system
• 6, Features of raster digital display system

Design of FPGA-based grating displacement measurement system

Abstract Introduction of an FPGA-based grating displacement measurement system. Explain the grating signal subdivision and measurement principle, and use the least squares method to design a raster measurement system with measurement points, lines, circles and other functions, and solve the problems of the current grating measurement system's slow speed, poor real-time, and unfriendly function single interface.

Grating measurement is a measurement technique based on the physical principle of Moore stripe formation, which is used to accurately measure the displacement of objects.The grating is an optical component composed of a series of parallel transparent and opaque stripes, and the width and spacing of each stripe are consistent.

Design a digital signal generator module: set a time interval as needed and send a digital signal at intervals. The digital signal can be any number from 0 to 9, and it is displayed as the corresponding number on the digital tube.

Grating ruler displacement sensor, referred to as grating ruler, is a measurement feedback device that uses the optical principle of grating.

What are the logical components of the raster scanning graphics system

The main input and output equipment of computer drawing? Composition of raster scanning display: The raster scanning display consists of three parts: graphics monitor, frame buffer memory and display controller.

The principle of shade-grating imaging tubes (such as Trilon and Diamond Long) is the same, but the mesh of such imaging tubes is formed by fixing many ratratings longitudinally in the frame. The so-called point distance refers to the distance between two phosphors of similar colors in the same image.

The radar grating scanning coordinate converter is a key component of the radar grating scanning display system.

Figures 3-3 (a) and (b) are the scanning rasters during the positive and inverse field respectively. The solid line in the figure is the positive line of the line of the line scan, and the dotted line is the reverse line of the line scan. It is characterized by: the 1-line frequency is an integer multiple of the field frequency, so the grating of the adjacent field is repeated to form a step-by-line scanning grating.

A computer consists of five logical components, including operator, controller, memory, input device and output device.In appearance, the computer is composed of a host box and an external device.

Raster scanning graphic display: abbreviated as raster display, it is a drawing device. It can be regarded as a dot matrix unit generator and control the brightness of each dot matrix unit. Working principle: In this kind of display, the trajectory of the electron beam is fixed. That is, scan the fluorescent screen from left to right and from top to bottom to produce a grating.

How does the grating measurement system determine the absolute zero line?

1. Disconnect the power switch (cut off the fire zero wire of the power supply) and measure two of the following wires, because the fire zero wire forms a loop through the electrical appliance. It is the fire zero wire that can measure a certain resistance with an ohm gear, and the other one with the two resistance is infinite, which is the ground wire, because the ground wire cannot follow The power cord is connected.

2. Disconnect the zero wire at the main switch, only connect the fire wire, turn the light at home in the open position, and test it with an electric pen. It was not lit just now, and now it is all the zero line that is lit. The rest that are not bright are all ground wires.

3. Hello! When using the grating equation to measure the wavelength of the light wave, it is necessary to adjust the slit to the minimum and rotate the grating parallel to the plane of the incident beam to the zero-level position. At this time, the brightest isospaced stripes can be observed.

4. If there is a discrepancy, it means that the wiring is wrong and needs to be excluded. At this time, the hole that is not bright is the ground wire. Then insert one pen of the meter into the ground wire hole, and insert the other two holes into the other two holes respectively. At this time, 220v is normal, and 0v means that the ground wire is missing. The ground line is determined, and the zero line is easy to find. The method is to restore the zero line and use an electric measuring pen.

5. First, use an electric pen to find the fire wire (the line that the electric pen shines, connect the light bulb to the fire wire, and name the remaining two wires: Line 1 and Line 2.

6. Measuring grating is a special photoelectric sensor. Like ordinary photoelectric sensors, it contains two parts of the transmitter and the receiver separated from each other and placed oppositely, but its external size is large and long tubular.

Briefly describe the grating system

Application of optical fiber grating in optical fiber communication system: As a new optical device, optical fiber grating is mainly used for optical fiber communication, optical fiber sensing and optical information processing; optical fiber grating self-question Since then, it has been widely used in the field of optical fiber sensing.

In optical fiber communication systems, optical fiber grating can be used to increase the capacity of the system and increase the stability of the signal in long-distance transmission. The working principle of optical fiber grating is based on the interference principle of light, which is determined by the fluctuation properties of light.

Grating is a parallel and equal-spacing grid with uniform arrangement, which can realize the storage and reading of various information such as digital, audio and video.Raster projection: Grating can also be used in the projection system to generate specific raster patterns.

I don't know what kind of grating you are talking about. There are two common types: interference and scattering of light related to optical experiments.

Raster scanning graphic display: abbreviated as raster display, it is a drawing device. It can be regarded as a dot matrix unit generator and control the brightness of each dot matrix unit. Working principle: In this kind of display, the trajectory of the electron beam is fixed.

Introduction to the raster digital display system

1. In the raster ruler, it is divided into several resolutions, such as 10u, 5u, 1u, 2u, 0.1u, etc. Their resolutions are different, and the accuracy displayed is also different. However, it is mainly the grating in the grating ruler that determines the accuracy of the raster digital display system.

2. The grating digital display ruler is a high-precision displacement sensor that digitally represents the linear displacement through the principle of molar stripe and photoelectric conversion. The raster digital display ruler is mainly composed of: reading head, main ruler and interface.

3. It has the most advanced and reliable optical measurement system: the sliding parts are designed with a high-precision five-bearing system that has been verified as the most reliable and durable to ensure the stability of the optical mechanical system, with excellent repeated positioning and high-level measurement accuracy.

4, JCXG type) can reach up to 3000mm, and the resolution is 0.5μ, 1μ, 2μ, 5μ, 10μ. In addition, various installation accessories can be provided according to user needs to facilitate system installation. There are many manufacturers below with the same installation size, including the largest two.

5. The digital display light deletion ruler is a light deletion displacement sensor with digital display function. It is composed of main grating, indicator grating, light source and optoelectronic components, etc. As shown in the figure, the main grating is connected to the object under test, and it moves with the linear displacement of the object under test. When the main grating produces displacement, the Moore stripe also produces displacement.

Features of raster digital display system

Raster display has the following characteristics: it has high resolution and can draw fine graphics. The response speed is fast, and text and pictures can be displayed quickly. The picture effect is good, and bright colors can be displayed. Fonts and text of different sizes can be distinguished. Low cost and easy maintenance.

In the grating ruler, it is divided into several resolutions, such as 10u, 5u, 1u, 2u, 0.1u and so on, their resolution is different, and the accuracy displayed is also different. However, it is mainly the grating in the grating ruler that determines the accuracy of the raster digital display system.

Features: Because the graphics are stored in the frame buffer in the form of a dot matrix. Therefore, the electron beam of the raster scanning display scans the screen in order from top to bottom and from left to right to establish graphics. Advantages and disadvantages: It can display colorful static and dynamic images, and the manufacturing cost is low, but the quality of the lines is not high.