[Current status and prospects of portable NIR spectrometer]

Area of Science:

• Analytical Chemistry
• Spectroscopy

Background:

• Near-infrared spectroscopy (NIRS) is a versatile, non-destructive analytical technique.
• NIRS finds applications in agriculture, food, chemical, and oil industries.
• Growing demand for on-site analysis necessitates portable NIRS instruments.

Purpose of the Study:

• To review the current state of portable near-infrared spectrometers.
• To detail various monochromator systems used in portable NIRS devices.
• To discuss design elements enhancing portability and usability.

Main Methods:

• Review of different monochromator systems: filter, grating, Fourier-transform, acousto-optic tunable filter (AOTF), and micro-electro-mechanical systems (MEMS).
• Analysis of advantages and disadvantages of each system.
• Description of typical instruments and their parameters.
• Discussion of sampling adapters, display, and power supply considerations for portability.

Main Results:

• Portable NIRS instruments utilize diverse monochromator technologies.
• Design considerations focus on ruggedness, compactness, and ease of use.
• Specific instrument examples and their parameters are presented.

Conclusions:

• Portable NIRS technology is advancing with various monochromator options.
• Future developments will likely focus on enhanced portability and performance.
• The review provides a comprehensive overview of current portable NIRS technology and future trends.