Table 5 Laser choices for reference and measurement.

From: Mid-IR standoff measurement of ageing-related spectroscopic changes in bitumen in the 6 µm (1700 cm−1) region. Part 1: Measurement strategy and instrument design principles

Purpose

Wavenumber/cm−1

Wavelength/μm

Technology

Carbonyl

1593.0

6.2775

QCL

Carbonyl

1641.4

6.0924

QCL

Carbonyl

1731.3

5.7760

QCL

Reference

2633.6

3.7970

ICL

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