1. Structure of the Optical Platform
High-performance optical platforms are engineered for precision measurement, laser experiments, and vibration-sensitive applications. Their structural design plays a vital role in ensuring flatness, thermal stability, and damping performance. Key features include:
All-Steel Construction with Honeycomb Core
The surface table and breadboard adopt a robust all-steel build, consisting of 5mm thick top and bottom plates, reinforced with a precisely welded 0.25mm steel honeycomb core. The honeycomb cells are formed using high-precision molds and positioned using welded spacers for consistent geometric spacing.
Thermal Symmetry for Dimensional Stability
The platform is symmetrically constructed along all three axes (X, Y, Z), allowing for uniform thermal expansion and contraction. This minimizes distortion caused by temperature fluctuations and ensures excellent flatness over time.
No Plastic or Aluminum Elements in Core
The honeycomb structure runs from the top to the bottom plate without the use of plastic or aluminum fillers, thereby avoiding potential deformation or mismatch in thermal coefficients. Steel side panels also enhance environmental resistance to humidity and temperature.
Precision-Machined Surface
Modern automated rail systems are used to polish and finish the platform's surface, producing a smoother and more level working area than older-generation platforms. Surface flatness is strictly controlled within 1 micron per square meter, providing an ideal base for sensitive instruments.
2. Measurement Method for Optical Platforms
To ensure performance and consistency, each optical platform undergoes precise testing during production:
Dynamic Response Testing
A controlled impulse is applied to the platform surface using a calibrated modal hammer, while sensors capture vibration data. This signal is then analyzed to produce a Frequency Response Function (FRF) curve.
Flexibility Curve Sampling
During R&D, multiple points on the surface are tested. The four corners are usually the most flexible areas, and thus the published compliance (flexibility) data is generally based on readings from these points using flat-mount sensors.
Individual Test Reports
Each unit is independently tested and shipped with a dedicated test report and dynamic compliance curve. This approach provides more accurate product data than using a generic compliance chart for all models.
Flexibility Data Significance
Compliance curves help users evaluate platform stability under worst-case conditions and are considered essential performance indicators in high-precision environments.
3. Importance of Vibration Isolation in Optical Platforms
Vibration sources can be classified into two categories: external and internal.
External sources include building vibrations, foot traffic, door movements, or mechanical shocks transmitted through the floor. These are mitigated using vibration isolation legs or pneumatic isolators.
Internal sources come from instrument vibrations, airflow, or coolant circulation. These require internal damping from the table structure to minimize disturbance.
Without proper vibration isolation, sensitive instruments may suffer from unstable readings, reduced resolution, or even inaccurate measurement results.
4. Natural Frequency & Its Effect on Platform Performance
The natural frequency of a system refers to the frequency at which it tends to vibrate in the absence of external forces. It is numerically equivalent to the resonance frequency.
Lower mass or lower stiffness results in a higher natural frequency.
Greater mass or increased stiffness results in a lower natural frequency.
By optimizing these two factors, the platform's susceptibility to external vibrations can be minimized, ensuring stability for metrology or optical experiments.
5. Overview of Air-Floating Isolation Platforms
Modern optical tables can be equipped with air-float (pneumatic) isolation systems for even higher stability. These are typically classified into:
XYZ linear air-bearing platforms
Rotary air-bearing stages
The working principle combines air bearings with precision motion control systems to create frictionless, contact-free movement. Air bearings can be divided into:
Planar air pads
Linear air-bearing guides
Air-bearing spindles
6. Industrial Applications of Air-Float Technology
Apart from precision measurement, air-float systems are also widely used in wastewater treatment. One example is the vortex air flotation unit, which disperses fine bubbles into the fluid through high-speed rotating impellers. These microbubbles attach to suspended particles or oil, allowing them to float and be separated from the liquid.
Applications include:
Petrochemical
Food processing
Textile dyeing
Electroplating
Slaughterhouse wastewater
Oil refining and more
If you're looking for a stable, high-precision optical platform or air-floating motion system, we provide customizable solutions tailored to your application. OEM/ODM services are available upon request.