Near-infrared imaging growing in demand

Near infrared (NIR) imaging is growing in demand around the globe, typically as a replacement for thermal or far-infrared (FIR) vision for night vision and its potential applications are growing.

04/07/2018


Image courtesy: Bob Vavra, CFE MediaNear infrared (NIR) imaging is growing in demand around the globe, typically as a replacement for thermal or far-infrared (FIR) vision for night vision. NIR cameras are able to detect the wavelengths of light directly adjacent to the visible light spectrum. Unlike thermal cameras, NIR cameras still detect photons like a camera in the visible light spectrum, just at a different wavelength. In the NIR spectrum, there are actually more detectable photons at night, which is what makes NIR cameras so valuable for night vision.

How does better night vision lead to global growth in NIR imaging, and what types of applications are using NIR cameras?

Demand for near infrared imaging

The market for all infrared devices will be worth $11.36 billion by 2022. The market will grow at a steady compound annual growth rate (CAGR) of 8.32% between 2016 and 2022. Surveillance applications and long-wavelength infrared (LWIR) devices were expected to see the most growth, but NIR devices will still represent a solid portion of this growth.

Technological advances in NIR imaging will be a major driver of growth in the coming years. NIR sensors often have low quantum efficiencies (QE), topping out at 58%. Recent breakthroughs, such as thicker silicon and extended deep trench isolation (DTI) architecture for increased photon absorption, can bring QEs as high as 90%. This makes them much more suitable for a wide range of applications, especially applications where range and accuracy are vital.

Near infrared and driving assistance

One of the best examples of NIR imaging in commercial applications would be their use in advanced driver assistance systems (ADAS). The U.S. and the E.U. have both mandated that all vehicles have some form of ADAS by 2020, so this technology will proliferate quickly. When compared to thermal vision, NIR vision is a clear winner. Thermal vision only detects heat. It's not good at producing crisp, clear images to facilitate semi- or full-autonomy.

NIR vision, on the other hand, is independent of an object's heat and takes clear images for ADAS to function properly at night. The only technical problem currently facing NIR vision deployment in ADAS is their limited effective range—often less than 600 ft. Despite this shortcoming, recent technological advances have addressed this problem and NIR imaging is still the best solution for applications like ADAS.

Demand for NIR imaging will grow around the globe for the foreseeable future. NIR cameras are particularly adept at functioning at night with little to no sources of light and will start making their way into a number of applications like imaging in ADAS systems.

This article originally appeared on the AIA website. The AIA is a part of the Association for Advancing Automation (A3). A3 is a CFE Media content partner. Edited by Chris Vavra, production editor, Control Engineeringcvavra@cfemedia.com.

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