Abstract
A contactless temperature measurement system is presented based on a hyperspectral line camera that captures the spectra in the visible and near infrared (VNIR) region of a large set of closely spaced points. The measured spectra are used in a nonlinear least squares optimization routine to calculate a one-dimensional temperature profile with high spatial resolution. Measurements of a liquid melt pool of AISI 316L stainless steel show that the system is able to determine the absolute temperatures with an accuracy of 10%. The measurements are made with a spatial resolution of 12 µm/pixel, justifying its use in applications where high temperature measurements with high spatial detail are desired, such as in the laser material processing and additive manufacturing fields.
| Original language | English |
|---|---|
| Article number | 91 |
| Pages (from-to) | 1-13 |
| Number of pages | 13 |
| Journal | Sensors |
| Volume | 17 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 5 Jan 2017 |
Keywords
- hyperspectral imaging
- temperature measurement
- laser material processing