Hamamatsu News 1 / 2018

InGaAs linear image sensors are useful because of their sensitivity in the near-infrared region. However, they are expensive and large and are used for high-end applications. Particularly non-destructive, non-contact infrared spectroscopic measurements have been performed mainly at the laboratory level. The G13913 series was developed as a new device for making these measure- ments possible on-site and in real-time. A back-illuminated structure (128 pixels, 256 pixels) was employed to make the sensor smaller and to reduce current consumption. The spectral response covers a range from 0.95 to 1.7 μm. The miniaturization of the device expands its application to hand-held professional component measuring instru­ ments and other applications used outside the laboratories. Application example of a hand-held measuring instrument Expanding the possibilities of near-infrared light spectroscopy and making components more visible 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.2 CCD image sensors (Si) InGaAs image sensors Near IR Visible UV Wavelength (µm) Absorption regions of substances H 2 O H 2 O H 2 O ROH ROH ROH ROH CHO CC CH CH CH CH CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 CH 3 CH 3 CONH 2 CONH 2 CONH 2 (R) CONHR RNHR 1 ArOH ArOH ArOH RNH 2 RNH 2 RNH 2 RNH 2 H 2 O H 2 O ROH RCO 2 H RCO 2 R´ CH CH ArCH ArCH ArCH ArCH SH CH 3 CH 3 CH 3 Wavelength region covered by image sensors 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.2 H 2 O H 2 O H 2 O ROH ROH ROH ROH CHO CC CH CH CH CH CH 2 CH 2 CH 2 CH 2 CH 2 CH 2 CH 3 CH 3 CH 3 CONH 2 CONH 2 CONH 2 (R) CONHR RNHR 1 ArOH ArOH ArOH RNH 2 RNH 2 RNH 2 RNH 2 H 2 O H 2 O ROH RCO 2 H RCO 2 R ′ CH CH ArCH ArCH ArCH ArCH SH CH 3 CH 3 CH 3 CCD image sensors (Si) InGaAs image sensors Near IR Visible UV Wavelength region covered by image sensors Absorption regions of substances Wavelength (µm) Development of a compact, low-cost sensor – bringing near-infrared spectroscopic measurement closer to practical application Near-infrared light spectroscopy is a method of measuring components by making use of when near-infrared light is applied to a measured object, the absorbed wavelengths differ depending on the substances. It is an analysis method that takes advantage of its non-destructive, non-contact characteristics and is used in a wide range of fields including physicochemical measurements and industrial measurements. Hamamatsu produces InGaAs image sensors for the near-infrared region as detectors for near-infrared light spectroscopy. The expanding product lineup offers a wide variety of types including different number of pixels and pixel sizes, various waveform types, up to a cutoff wavelength of 2.6 µm using unique production technology. These products expand the possibilities of near-infrared spec­ trophotometry where demand will increase in the future in food component analysis and other applications. InGaAs linear image sensor In Focus 16 News 2018 Vol. 1