How to Identify the Quality of a Marble Optical Platform
AppearanceThe optical platform should have an aesthetic appearance. All parts must be free of sharp angles and edges that may compromise safety. More importantly, check whether the chamfers of the holes are uniform (after screwing in the threaded holes, they should be perpendicular to the platform surface), and whether the four sides and their chamfers are straight and consistent. If the tabletop is not mechanically processed but manually polished, the chamfers of the holes will vary in size, and visual inspection along the four sides of the tabletop will reveal that the chamfered areas are curved.
Natural Frequency (≤2Hz)Natural frequency, also known as inherent frequency or self-vibration frequency, ensures the vibration isolation effect of the system only when the ratio of the environmental disturbance frequency (f) to the platform's natural frequency (fo) is f/fo > √2. Therefore, the lower the natural frequency of the optical platform, the better the vibration isolation effect. To detect this indicator, vibration spectrum analyzers and portable vibration analyzers are generally used for multi-point measurements. If the supplier lacks such instruments, you can roughly measure the natural frequency by pressing down (or pushing sideways) the platform with force, then releasing it quickly to let it vibrate up and down (or swing left-right/front-back) significantly. For example, one reciprocation per second equals 1Hz, two reciprocations equal 2Hz, and so on.
Flatness (≤0.05mm/m²)A smaller value of this indicator means a flatter tabletop, making optical path adjustment easier. The general factory requirement is flatness <0.05mm/m², detected by methods such as photoelectric autocollimator, optical flatness tester, level meter, laser flatness detector, etc. For optical platforms installed in laboratories, photoelectric autocollimators and optical straightness testers are commonly used, with results obtained through calculation. These instruments must be equipped by manufacturers.
Surface Matt Texture and Roughness (Ra≤0.8μm)This indicator ensures the optical platform has a smooth but non-reflective working surface. Good surface roughness helps protect experimental instruments. The general factory requirement is Ra≤0.8μm, which can be detected by visual comparison with a sample or a roughness tester. On-site detection is preferably done with a roughness tester, which is portable, provides direct readings, and has high accuracy.
Repeat Positioning Accuracy (±0.10mm)This indicator ensures the tabletop remains horizontal under dynamic conditions for easy optical path adjustment. The detection method is to fix a dial indicator (accuracy 0.02mm) on a stable object, with the probe against the tabletop. Repeatedly load and unload the tabletop, and if the reading stabilizes within ±0.10mm, it is qualified.
Tabletop Amplitude (So≤2μm)Under normal use, the optical platform must maintain the lowest possible amplitude to ensure instrument accuracy. Comparing the platform's amplitude with ground amplitude reflects the system's vibration isolation performance: if the platform amplitude is lower than the ground's, it indicates vibration isolation; otherwise, it may amplify vibrations or fail to isolate them. Amplitude detection methods are similar to those for natural frequency.
High-quality optical platforms require not only high-precision machining equipment but also high-tech testing methods and instruments. Only such platforms can guarantee the normal conduct of high-precision scientific experiments and research.
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