[Research on Small-Type and High-Spectral-Resolution Grating Monochromator]

Area of Science:

• Optics and Photonics
• Spectroscopy
• Instrument Design

Context:

• Hyperspectral imaging spectrometers require continuous spectral calibration for accurate data acquisition.
• Existing calibration equipment can be bulky or lack the necessary spectral resolution.
• A compact and high-performance solution is needed for field or space-constrained applications.

Purpose:

• To design a small-type, high-spectral-resolution grating monochromator for continuous calibration of hyperspectral imaging spectrometers.
• To detail the design process, including grating selection, focal length calculation, and slit sizing.
• To develop a method for evaluating wavelength repeatability and precision.

Summary:

• A horizontal Czerny-Turner grating monochromator was designed, prioritizing high spectral resolution and compact size.
• Key structural parameters were determined, and their impact on spectral resolution and volume was analyzed.
• Mechanical components were optimized for a small and portable instrument, including slit, lens, and scanning mechanisms.
• Wavelength calibration was performed using a mercury lamp, and a method for assessing wavelength accuracy was established.
• Experimental results demonstrate a spectral resolution better than 0.1 nm and high wavelength precision (±0.0969 nm) in the 400-800 nm range.

Impact:

• Enables precise and continuous spectral calibration of hyperspectral imaging spectrometers.
• Facilitates the development of smaller, more portable spectral imaging systems.
• Improves the accuracy and reliability of hyperspectral data for various scientific and industrial applications.
• Provides a validated method for assessing the performance of spectral calibration instruments.