Hamamatsu Corporation has introduced two new InGaAs linear image sensors, the G9494-256D and G9494-512D, for high-speed detection of near-infrared light in the spectral range between 0.9 microns and 1.7 microns. These new sensors are intended for on-line foreign object inspection systems and for near-infrared spectroscopy. Their data rate is typically 2 MHz. The new sensors also feature square pixels, which are ideally suited for use with pattern recognition software. Pixel size on the G9494-256D is 50 microns x 50 microns (x 256 pixels), while on the G9494-512D it is 25 microns x 25 microns (x 512 pixels).
The G9494-256D and G9494-512D feature on-chip CMOS signal processing circuitry, including a capacitive trans-impedance amplifier (CTIA) that performs simultaneous charge integration on all pixels in order to eliminate time lag among the pixels' output signals. Both sensors use a 5V power supply, can be operated at room temperature, and have very low dark current. Conversion gain can be adjusted to either 0.1 pF or 1 pF.
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