Calibration-Free Travel Time After Photobleaching Velocimetry

TL;DR

This paper introduces a novel calibration-free velocimeter that measures flow velocity at interfaces with high resolution, overcoming the need for pre-calibration in laser-induced fluorescence photobleaching anemometry.

Contribution

The paper presents a new method, TTAPV, that enables calibration-free flow velocity measurements at interfaces with ultrahigh spatial and temporal resolution.

Findings

Achieves nanoscopic resolution in flow measurement.

Eliminates the need for pre-calibration in LIFPA.

Applicable to unknown flow conditions.

Abstract

In interfacial science, there is an increasing need to measure flow velocity fields at interfaces with ultrahigh spatial and temporal resolution to study transport phenomena. Although laser-induced fluorescence photobleaching anemometry (LIFPA) has achieved nanoscopic resolution for flow measurement, it requires pre-calibration, which is unavailable for unknown flows. We present a novel, calibration-free travel time after photobleaching velocimeter (TTAPV) which can both measure fluid flow velocity and satisfy the long-anticipated need of calibration for LIFPA.