Non-contact laser photo-thermo-mechanical radiometry for stress measurement
Innovative non-contact photo-thermo-mechanical radiometry (PTMR) technology measures mechanical stress-strain in metallic materials using thermal conductivity anisotropy. Validated under lab conditions, this method offers non-destructive stress evaluation up to fracture, outperforming traditional gauges.
Overview
Non-contact laser photo-thermo-mechanical radiometry (PTMR) provides a method for evaluating mechanical stress–strain relationships in metallic materials. Using mid-infrared camera imaging and lock-in thermography (PTM-LIT), the technique measures stress-induced thermal conductivity anisotropy, producing a characteristic “thumbprint” of applied external forces. It supports non-destructive testing from the stress-free state to ultimate mechanical strength, aiming to exceed the capabilities of traditional contacting strain gauges.
Technical specifications
Key features:
- Non-contact and non-destructive stress evaluation
- Uses mid-infrared imaging to detect thermal conductivity anisotropy
- Measures stress across the entire elastic regime up to fracture
- Two measurement modalities: frequency scans at fixed load and strain scans at fixed frequency
- Validated under laboratory conditions using a pre-prototype setup
Technology readiness level
Currently at TRL 4, the technology has been validated in laboratory settings. Future adaptations for specific applications are planned following stakeholder interest, with a preferred partnership model of sponsored research or co-development.
About University of Toronto
The University of Toronto is a comprehensive public research university with three campuses in the Toronto region and a globally scaled research enterprise. Its downtown footprint is embedded within a major academic health network and an adjacent innovation district, enabling co-located labs, clinical trials, and rapid testing with end users. Companies connect through co-op and long-duration internships, sponsored research, and access to shared core facilities and prototyping resources. Research is supported by Canada’s Tri‑Agency (NSERC, CIHR, SSHRC) and the Canada Foundation for Innovation, alongside provincial programs and industry partnerships. A dedicated technology transfer office provides IP management, licensing, and startup support through a coordinated entrepreneurship network.
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