Discussion on the Technology of Image Measuring Instrument-EEWORLD

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Image measuring instrument and image alignment projector (real and fake image measuring instrument)

[Image measurement] is a new term in the field of industrial inspection and measurement technology today. It represents the advanced measurement technology of integrating digital technology into industrial inspection and measurement and performing spatial geometric calculations. Because its cutting-edge nature is not well known to the public, many [image alignment measurement projectors] nowadays follow the trend and call themselves "image measuring instruments". The

real [image measuring instrument] (also known as image surveying instrument) is based on CCD digital images and relies on computer screen measurement technology and powerful software capabilities of spatial geometric calculations. After installing special control and graphic measurement software, the computer becomes a measurement brain with a software soul and is the main body of the entire device. It can quickly read the displacement value of the optical ruler, and instantly obtain the desired result through software module calculation based on spatial geometry; and generate graphics on the screen for the operator to compare images and shadows, so as to intuitively distinguish possible deviations in the measurement results. All of this is done in real time in the face of today's powerful computer computing power, and the operator himself cannot detect it. This kind of precision instrument that can use CCD digital images and computer software to calculate and meet the needs of complex measurements is a true image measuring instrument.

It can be seen that the computer in the image measuring instrument not only performs simple numerical display, but more importantly, it has basic functions such as spatial geometric calculation, graphic display, dimensioning, and output of CAD graphics. All of this depends on powerful special software.

[Image alignment measurement projector] has a very prominent feature, that is, it has both a [digital display screen] and a computer. This feature itself is very funny, because since there is a computer monitor, the [digital display screen] should be meaningless. The information format and capacity that the computer can display are really beyond the reach of the digital display screen. The computer in the image projection measuring instrument is so pitiful that it is only equivalent to a TV or monitor with a cross generator. It is only used as a "target range" for visual alignment and becomes a fake decoration, a bunch of electronics and machinery without any "intelligence". Therefore, it is not difficult to distinguish between true and false image measuring instruments. First, see whether it has an extra digital display screen, and secondly, see whether it has spatial geometric calculation capabilities.

Jiagong Machinery Power Grid
VM Series Fully Automatic Image Measuring Instrument

The development history of image measuring instruments.

Once upon a time, facing the high technical thresholds of light, machinery, electricity and software, many companies stopped. The mysterious veil of measurement software has almost become an insurmountable gap that blocks newcomers. Today, the mystery of software is no longer there. The former "building block technology" is struggling in the face of pressure from all sides, and a new round of R&D competition has quietly formed. This year, a new generation of image measuring instruments (also known as CNC imagers) with digital capabilities was born, which pushed this technology and market competition to a climax and theme. It can be said that the image measuring instruments that bid farewell to the hand-cranked era and move towards the digital, intelligent and automated era are the true two-dimensional and three-dimensional. Behind the "faster, more accurate, and more convenient" are the satisfactory performance parameters such as ±2um measurement accuracy, 750mm/min measurement speed, and the high efficiency and convenience of "point and go", "image and shadow synchronization", and "arbitrary placement of workpieces". The limitations of the hand-cranked era have been changed. In terms of accuracy, speed, and operating performance, the measuring projector has been left behind and has become a standard, which makes the image measuring instrument capable and capable of taking on the mission of "the end technology of measuring projectors and tool microscopes". Moreover, the price positioning is in line with the consumption level of the Chinese market, thus beginning to have the competitiveness of mainstream products. Orderly competition can benefit the public, greatly shortening the distance between China's industrial testing equipment and the international level, and moving towards the direction of international integration.

The difference between digital image measuring instrument (CNC version) and hand-cranked image measuring instrument

The image measuring instrument (also known as image precision surveying instrument) is a qualitative leap based on the measuring projector. It has upgraded the industrial metrology method from the traditional optical projection alignment to the computer screen measurement based on the digital image era. It is worth mentioning that there is a transitional product on the market that has both a digital display and a computer connection. Strictly speaking, this kind of equipment that only uses a computer as a sighting tool is not an image measuring instrument, but can only be called an "image measuring projector" or an "image alignment projector". In other words: the image measuring instrument relies on computer screen measurement technology and powerful spatial geometry calculation software. Image measuring instruments are divided into digital image measuring instruments (also known as CNC image measuring instruments) and hand-cranked image measuring instruments. The differences between them are mainly reflected in the following aspects:

1. Digital CNC technology realizes the point-to-point movement:

The operation of the hand-cranked image measuring instrument to measure the distance between points A and B is: first shake the X and Y direction handles to align with point A, then operate the computer by hand and click the mouse to confirm; then shake the hand to point B, and repeat the above actions to confirm point B. Each time you click the mouse, the displacement value of the optical scale at that point is read into the computer. When the values of all points are read in, the computer automatically calculates and obtains the measurement results. All functions and operations are performed separately.

The digital CNC image measuring instrument is different. It is based on micron-level precision numerical control hardware and humanized operation software. It thoroughly integrates various functions to become a truly modern precision instrument. It has basic capabilities such as stepless speed change, soft movement, point-to-point movement, electronic locking, and synchronous reading. After the mouse moves to find the two points A and B you want to measure, the computer has calculated the measurement results for you and displayed the graphics for verification. The image and shadow are synchronized, so even beginners only need a few seconds to measure the distance between two points.

Second: Digital technology realizes the arbitrary placement of workpieces:

When the hand-cranked image measuring instrument performs benchmark measurement, it is necessary to shake the work platform and then judge the required points by thinking. The digital image measuring instrument can use software technology to complete the complex conversion between the rotation of the spatial coordinate system and multiple coordinate systems. The workpiece to be measured can be placed at will, and the coordinate origin and reference direction can be established at will to obtain the measured value. At the same time, the mark is displayed on the screen, and the coordinate direction and measurement point can be intuitively seen, making the most common reference distance measurement very simple and intuitive.

Three: Digital technology can perform CNC fast measurement:

When the hand-cranked image measuring instrument performs batch measurement of the same workpiece, it needs to be manually moved one by one by hand. Sometimes it has to be shaken tens of thousands of times a day, and it can still only complete the limited measurement of dozens of complex workpieces, which is inefficient.

The digital image measuring instrument can establish CNC coordinate data through sample measurement, drawing calculation, CNC data import, etc. The instrument automatically moves to the target point one by one to complete various measurement operations, thereby saving manpower and improving efficiency. With a working capacity dozens of times that of the hand-cranked image measuring instrument, the operator is relaxed and efficient. (end)

Reference address：Discussion on the Technology of Image Measuring Instrument

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