Laser Interferometer Dedicated for Granite Platforms | Comprehensive Selection Guide (Universal fo Grade 000/00/0)
Select based on 5 core dimensions: platform accuracy grade, table size, workshop environment, inspection items, and national standard traceability. Directly matches ite flatness / straightness / perpendicularity 3D inspection.
I. Determine the Core First: Single-Frequency vs. Dual-Frequency Laser (Must Choose Dual-Fy)
- Single-Frequency Laser Interferometer
Accuracy: ±1ppm, Resolution 0.01μm
Poor anti-interference: Drifts due to tempere drift, air currents, and slight vibrations
Only suitable for: Constant temperature dust-free laboratories, small tables Grade 0 and below, static calibration
❌ Not recommended for on-site workshop met of granite platforms - Dual-Frequency Laser Interferometer (Standard for granite inspection · Similar to Renishaw XL-80)
Accura, Resolution 0.6nm
Extremely strong heterodyne anti-interference, no drift from air conditioning, workshop vibrations, or temperature fluctuations
No cumulative error over lones, suitable for large granite bases / gantry tables
✅ The only first choice for factory calibration of Grade 000/00 platforms and CMA metrology arbi
II. Select Instrument Grade Based on Granite Platform Accuracy Grade
Таблица
| Granite Platform Grade | Flatness Requirement | Minimum Laser Interferometer Configuration |
|---|---|---|
| Grade 000 (Semiconductor / CMM Reference) | ≤2μm/m | Nanometer-level dual-frequency angular flatness accessory full grid 3D fiting |
| Grade 00 (Optical / Ultra-high Precision Fixtures) | ≤5μm/m | High-precision dual-frequency, angular interferometer module |
| Grade 0 (Workshop Precisio Inspection) | ≤10μm/m | Standard dual-frequency straightness angle combination |
| Grade 1 and below | ≥15μm/m | Electronic level isfficient, no laser needed |
III. Select Measurement Range & Bridge Configuration Based on Table Size
≤1500mm Small Platforms
Range: 0~4m is suffiient
Bridge: Standard 150/200mm pitch
1500~3000mm Medium Platforms / Machine Tool Beds
, prioritize angular interferometry method, no cumulative error over long distances
Extended bridge long-distance retroreflector assembly
3000mm Large Gantry / Granite Beams
Range: 0~15m , Angular laser interferometry
Pair with laser tracker to verify overall plane cloud map
IV. Must Equip with Granite-Specific Inspection Aessories (No exceptions allowed)
Angular Interferometer Set (Core for flatness)
Measures table tilt and undulation → converts to full plane height difference, dedicated for national sandard JJG117 plate calibration
Flatness Scanning Bridge Granite-Specific Retroreflector
Conforms to stone mirror surface, does not scratch working surface, moves smoothly without vibrationTemperature, Humidity, and Air Pressure Compensation Module
Granite is sensitive to thermal expansion, automatically corrects temperature / air pressure / air refractive index errors
OrthogonalAngle Mirror Set: Simultaneously measures perpendicularity, parallelism, and position
Grid Flatness Software: Cross diagonal full-area sampling, least squares evaluation, outp error cloud map
V. Workshop Environment Adaptation Selection (Key to stable readings on-site)
Constant Temperature Dust-Free Workshop (20±0.5℃): Any dual-freques acceptable
Ordinary Production Workshop (with vibration, direct AC airflow)
Must select: High-stability dual-frequency strong environmental compensation wireless acquisition, isolates air current and vibration nterference
Humid and Dusty Environment: Select sealed optical mirror set, oil-proof coating, protects laser beam path
VI. Key Technical Parameter Hard Thresholds (Must be met for Grade 00 Granite or above)
Laser frequency stabilization accracy: ≤±0.05ppm
Angular resolution: ≤0.001″ (arcseconds), corresponding height difference 0.001μm/m
Repetability: ≤0.1μm, no deviation in multiple re-measurements
Complies with JJG117 and GB/T4987 granite surface plate verification regulati; capable of issuing CNAS/CMA calibration certificates
Helium-neon stabilized light source, wavelength 632.8nm, long-term stability, no attenuation ovr time
VII. Mainstream Model Selection (Industry Standard)
Imported High-End (Grade 000 Arbitration / CMM Acceptance): Renisha80
Full form and position measurement, top-tier anti-interference, software adapted to national standards, traceable to national benchmarks
Domestic High Precision (Factory mass production verification cost-effectival-frequency laser full set of planar angle modules
Meets accuracy standards, fast after-sales service, moderate price, suitable for batch inspection of Grade 00/0 granie platforms
Not Recommended: Low-end single-frequency, short range, no angle module, no dedicated flatness algorithm
