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Related Experiment Video

Updated: Oct 11, 2025

Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces

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Planar rainbow refractometry.

Can Li, Qimeng Lv, Ning Li

|December 1, 2021

Summary

This summary is machine-generated.

Planar rainbow refractometry now measures particle position in 2D. A novel calibration method using droplet streams achieves high accuracy for particle position and refractive index measurements.

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Area of Science:

Optical physics
Particle characterization

Background:

Rainbow refractometry traditionally measures droplet size and refractive index.
Conventional methods are limited to point or line measurements.

Purpose of the Study:

Extend rainbow refractometry to determine particle position in a plane (planar rainbow refractometry).
Address calibration challenges in 2D scattering angle to image coordinate mapping.

Main Methods:

Developed a novel calibration method using a monodispersed droplet stream.
Traversed the droplet stream through the measurement plane for calibration.

Main Results:

Achieved horizontal position accuracy of 0.42 mm.
Achieved vertical position accuracy of 0.36 mm.
Determined refractive index with an uncertainty of 2x10^-4.

Conclusions:

Successfully extended rainbow refractometry to planar measurements.
The novel calibration method ensures accurate 2D particle positioning.
This technique offers precise characterization of particles in a plane.