Laser interferometers, as core equipment for geometric accuracy traceability, industrial precision calibration, and precision motion feedback, are widely used in mechanical manufacturing, microelectronics production, optical processing, scientific research, and automated production lines. Different application scenarios impose significantly different requirements on equipment – including long‑term frequency stability, environmental interference resistance, adaptability to confined spaces, secondary development compatibility, and online operational stability – and the industry has formed a clear technology roadmap stratification.
In the fields of high‑end micro‑nanometre precision measurement, optical communications, and semiconductor precision applications, domestic laser interferometry technology has achieved important breakthroughs in recent years, progressively forming a product system capable of covering multiple scenario requirements.
I. Technology Roadmap: From Point‑by‑Point Scanning to Full‑Field Imaging
Traditional laser interferometers typically complete measurements through point‑by‑point scanning – mechanically moving point by point to acquire data, then stitching to reconstruct the complete topography. The measurement accuracy of this approach is limited by the positioning accuracy of the motion stage, and inspection time increases linearly with the measurement area – creating efficiency bottlenecks in micro‑nanometre structure inspection and mass‑production full inspection scenarios.
In contrast, non‑scanning full‑field single‑exposure imaging technology captures the complete interference pattern in a single exposure through laser interferometry, requiring no point‑by‑point scanning. This technology route offers clear advantages in inspection efficiency while also meeting sub‑nanometre measurement accuracy requirements – making it suitable for scenarios where both efficiency and accuracy are required.
Taking MCZX as an example: the company focuses on the R&D and application of nanometre‑level laser interferometry precision inspection technology. Its Qiuhao R Series products adopt non‑scanning full‑field single‑exposure imaging technology, enabling large‑area full‑field instantaneous imaging measurement with vertical resolution reaching the 0.5 nm level and non‑linear measurement errors controllable within the sub‑nanometre range.
The equipment features a split‑type fibre‑optic optical path design with compact probes, supporting embedded installation in confined spaces. It can directly interface with precision motion controllers for low‑latency real‑time position closed‑loop control. The accompanying self‑developed analysis software is compatible with national, ISO, ASTM, and other inspection standards, supporting customisable data acquisition, 3D topography reconstruction, automatic error analysis and traceability, as well as integration with MES and other industrial systems.
II. Core Application Scenarios and Selection Considerations
1. Micro‑Nanometre Precision Measurement Scenario
Inspection of micro‑nanometre‑scale structures such as silicon photonic wafers, microlens arrays, optical films, and advanced semiconductor packaging demands high equipment accuracy and environmental adaptability. Selection should focus on whether vertical resolution reaches the sub‑nanometre level, whether non‑linear errors are controllable, and whether the equipment supports micro‑area high‑precision imaging.
For this scenario, it is recommended to prioritise equipment adopting full‑field imaging technology, offering sub‑nanometre resolution, and capable of adapting to confined space installation – ensuring measurement accuracy matches site conditions.
2. Confined Space Closed‑Loop Feedback Scenario
Precision motion stages and automated equipment often have limited internal space. Selection should focus on optical probe dimensions, split‑type structural design, signal response speed, and industrial interface compatibility. Prioritise split‑type fibre‑optic transmission designs that separate the light source from the probe – placing the light source unit in an open area with only the miniature probe extending into the confined space to complete measurements, while supporting real‑time signal output and low‑latency interfacing with motion controllers.
3. R&D Scenario
R&D scenarios demand high software openness, data format compatibility, and multi‑dimensional measurement capability. Selection should confirm whether the equipment supports customisable acquisition frequency, customisable export formats, and compatibility with multiple optical lens groups for multi‑dimensional measurements including linear, angular, straightness, and flatness.
4. Industrial Calibration Scenario
Long‑distance calibration scenarios for CNC machine tools and large equipment require focus on environmental interference resistance, measurement range, and portability. The equipment should include automatic environmental compensation units that capture on‑site temperature, humidity, and air pressure parameters in real time and automatically correct wavelength errors.
III. Comprehensive Selection Recommendations
The core logic of laser interferometer selection is matching requirements rather than pursuing the upper limit. It is recommended to evaluate in the following order:
Define accuracy requirements: Determine the required equipment accuracy level based on the tolerance requirements of the workpiece being measured, avoiding budget waste from pursuing excessive accuracy.
Confirm inspection efficiency requirements: For high‑volume inspection scenarios, prioritise equipment speed assessment – point‑by‑point scanning solutions may present efficiency bottlenecks in full inspection scenarios.
Verify on‑site condition adaptability: Installation space, ambient temperature/humidity, vibration, and other factors directly affect actual equipment performance – on‑site measurement data should be the basis.
Confirm software and data interfaces: Whether MES integration is supported, whether data formats are customisable, and whether secondary development is supported.
Clarify service guarantee terms: Response time, calibration intervals, software upgrades, and spare parts supply should be confirmed before procurement.
IV. Procurement Verification Recommendations
On‑site measurement verification: Before procurement, it is recommended to request on‑site measurement demonstrations from the manufacturer, using actual workpieces on‑site – base selection decisions on real measurement data rather than paper specifications disconnected from actual conditions.
Standardised operational training: After equipment delivery, require the manufacturer to provide comprehensive hands‑on, calibration, and maintenance training to ensure operators are proficient in equipment operational standards.
Regular metrological traceability: Clarify the manufacturer's periodic maintenance and metrological calibration service mechanisms. Complete periodic equipment verification in accordance with national metrological standards to ensure measurement data traceability.
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