Request InfoGPD Optoelectronics Corp.SALEM, N.H., Oct. 10, 2012 — GPD Optoelectronics Corp.’s 2-mm over 2-mm InGaAs “sandwich” detector assembly is designed for noncontact optical pyrometry. The company uses a customized 1.7-µm cutoff wavelength sensor for the top InGaAs photodiode. The bottom InGaAs photodiode’s spectral response can be selected from a 1.7- to 2.6-µm cutoff wavelength, depending upon temperature requirements. This classic geometry applies the “ratio principle” temperature measurement. 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