Among them, geometric measurement mainly involves length, angle, shape, etc., and length measurement is a basic one. The basic principle of length measurement is to determine the length of an object by measuring the distance between the two ends of the object by using the scale or measuring sensor of the measuring instrument. Angle measurement is to determine the angle of objects by measuring the included angle between them. Shape measurement is to describe the shape characteristics of an object by measuring the curvature and bending degree of its surface.
Traditional geometric measuring instruments include micrometer, angle ruler, vernier caliper and so on. These instruments can meet the general requirements of geometric measurement. However, with the development of science and technology, more and more high-precision measuring instruments are applied to the field of geometric measurement. From the nano-optical three-dimensional profilometer to the three-dimensional shape measurement of the object through the optical principle, to the high-precision (micron level), large workspace (100 meter level) coordinate and spatial attitude measurement of the 100 meter level laser tracker, the accuracy and efficiency of geometric measurement have been greatly improved;
1, optical three-dimensional surface profilometer
SuperViewW optical three-dimensional surface profilometer is based on the principle of white light interference, which measures and analyzes the key parameters and dimensions of sample surface morphology in a three-dimensional non-contact way. The instrument can achieve high-precision measurement from ultra-smooth surface of 0. 1nm to rough surface of tens of microns.
2. Coordinate measuring machine
MarsClassic CMM is a domestic CMM. The controller, probe, base and software are independently developed, which is safe and controllable. The maximum allowable indication error is (1.5+L/350) μ m, and the measuring stroke is extended from 500mmx700mmx500mm to 800m×1000m× 600mm, which provides rich measuring solutions.
3. Roughness profiler
The integrated roughness profiler can measure and evaluate the profile and roughness parameters at the same time. SJ5730 has a wide roughness measurement range of 12mm~24mm, with a resolution as high as 0. 1nm and a system residue of less than 3nm. Nano-scale large-range roughness measurement has the characteristics of high precision, high stability and high repeatability, and is a sharp tool for fine roughness measurement in the field of large surface measurement (bearings, artificial joints, precision molds, gears, blades and bearing rollers).
4. Fully automatic imager
The raster display resolution of the automatic imager is 0. 1μm, which meets various measurement requirements by combining the functions of flight measurement, image stitching, independent lifting of ring light, image matching and non-contact three-dimensional scanning imaging.
5. Laser tracker
The maximum measuring radius of the laser tracker is 80 meters. It is a portable large-scale coordinate measuring machine with high precision (micron level) and large working space (100 meter level). It can be used with various cooperative target probes, and can accurately measure geometric features such as points, lines, surfaces and curved surfaces in large-scale space. It can quickly and accurately measure complex features such as internal features, hidden features or curved surfaces of the workpiece according to the precise spatial posture of the cooperative target.
How to choose the right musical instrument? The geometric properties and accuracy requirements of the measured object should be determined according to the needs, and appropriate measuring instruments should be selected.
Geometric measurement is an important technology in the field of modern engineering. Accurate measurement of geometric properties such as shape and size of objects can provide important basis for product design and engineering measurement. In the process of measurement, it is necessary to understand the basic principles and precision instruments, pay attention to selecting appropriate instruments, control environmental factors, and improve the technical level of operators. Only in this way can we obtain accurate and reliable geometric measurement results and provide strong support for engineering practice.