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Implementation of a Reference Interferometer for Nanodetection
Published on: April 26, 2014
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Real-time laser detection method for edge position of objects with nanometer level accuracy
Applied Optics
|March 17, 2026
Summary
This study introduces a novel object edge detection method using a position-sensitive detector (PSD) with optical drift compensation. The technique achieves nanometer-level accuracy for precise object displacement and angle measurements.
Area of Science:
- Optoelectronics
- Precision Metrology
Background:
- Accurate object edge detection is crucial for precision engineering.
- Existing methods often struggle with optical drift and limited sensitivity.
- Position-sensitive detectors (PSDs) offer potential for high-resolution measurements.
Purpose of the Study:
- To develop an object edge position detection method with integrated optical drift compensation.
- To achieve ultra-high sensitivity for measuring object displacement and light deflection.
- To enhance the accuracy and real-time performance of edge detection systems.
Main Methods:
- Utilizing the defect spot working mode of a position-sensitive detector (PSD).
- Leveraging PSD output characteristics, spot asymmetry, and size transformation for sensitivity gain.
- Implementing a co-path compensation optical path structure for real-time drift correction.
Main Results:
- Achieved a sensitivity of 0.9 nm for edge position detection.
- Demonstrated a standard deviation of 5 nm in multiple detections.
- Verified feasibility and effectiveness through calibration and PZT experiments.
Conclusions:
- The proposed method offers nanometer-level detection accuracy.
- The system exhibits advantages in simplicity and real-time performance compared to image recognition methods.
- Suitable for applications in precision positioning and measurement.
