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The low-cost thermal infrared &#x2018;THz-Torch&#x2019; concept (referred to here as &#x2018;THz-T&#x2019;) was first introduced over a decade ago, and since then the associated &#x2018;over the THz horizon&#x2019; thermal infrared (10-100 THz) implementation technologies have continued to advance. While short range secure wireless communications links have received a great deal of attention, material spectroscopy has only briefly been introduced in a short conference abstract. Here, for the first time, we explore in depth the basic concepts behind THz-T spectroscopy. Moreover, when compared to the unvalidated results within our previous work, we demonstrate an enhanced experimental THz-T spectrometer. A detailed thermal noise power link budget model for both the transmission and reflection modes of operation have been undertaken and independently validated. As a proof of principle, a diverse array of different material types has been characterized. This includes glass sheets, semiconductor wafers, ceramic plate, plastic tape, plastic sheets, as well as polymer and cotton paper banknotes. THz-T technology has the advantages of hardware simplicity and low cost non-destructive testing for ubiquitous applications.

Low-Cost Thermal-Infrared ‘THz-Torch’ Spectroscopy