(�]G�Ӭ�%8���3�)�YY[j�٫x[�ʭ��/+\�q At longer wavelengths, in the infrared, detectors work on either of two processes. �AƲ��%��̒4������.��U���� /���ZU��hj�|������7;m�*��g)�����I��h\*��ґ^�=�k~K7 CCD working. We will see that this has certain implications for how the CCD operates. Rain Bucket CCD readout. Light is a very narrow band in the electromagnetic spectrum . Photon or quantum detec-tors are based on the response of semi-conductors to the absorption of an IR photon. CCDs Galore. For a 4 phase pixel 4 of these steps are required to transfer the charge one pixel down the array. A single transfer step is shown below. ��S雷چ ,��e�n�ik왅5�H�vZ"�֦��ͦ)S������͚g��AD^"~X��i4�������/~$���Hϰo\���C���`,�%P endstream endobj 87 0 obj 315 endobj 69 0 obj << /Type /Page /Parent 63 0 R /Resources 70 0 R /Contents 76 0 R /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 70 0 obj << /ProcSet [ /PDF /Text ] /Font << /F1 73 0 R /F2 72 0 R /G1 75 0 R >> /ExtGState << /GS1 80 0 R /GS2 81 0 R >> >> endobj 71 0 obj << /Type /FontDescriptor /Ascent 718 /CapHeight 718 /Descent -207 /Flags 32 /FontBBox [ -166 -225 1000 931 ] /FontName /NEPCJK+Helvetica /ItalicAngle 0 /StemV 88 /XHeight 523 /StemH 88 /CharSet (�8�\(���g��Ѡ��d�Y�!�Q_KG-J�\rq&\r~����A�c��=�VZ\n��'��\\T�jMt�:.\ W>��]���KL��G�0��cNg�J�:�%���l����$����Ô� ����?^�l��J��}��+U\ ���ݶ��\(��� ���������%���'ֵ���/�I�[��NwMŌ�_�L��9�i�}�� �x��D�\ ���� m��j�������a�QY \($��,L���7gӚ�8p�{���v��*sF) /FontFile3 78 0 R >> endobj 72 0 obj << /Type /Font /Subtype /Type1 /FirstChar 0 /LastChar 213 /Widths [ 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 355 556 556 889 667 191 333 333 389 584 278 333 278 278 556 556 556 556 556 556 556 556 556 556 278 278 584 584 584 556 1015 667 667 722 722 667 611 778 722 278 500 667 556 833 722 778 667 778 722 667 611 722 667 944 667 667 611 278 278 278 469 556 333 556 556 500 556 556 278 556 556 222 222 500 222 833 556 556 556 556 333 500 278 556 500 722 500 500 500 334 260 334 584 278 0 0 0 0 0 0 0 0 0 0 556 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 556 556 0 350 0 0 0 737 0 0 333 278 0 0 278 584 278 278 0 556 278 278 278 278 278 0 0 278 0 0 0 0 0 278 0 278 278 0 0 0 278 0 0 0 0 0 0 0 0 0 0 222 ] /Encoding /MacRomanEncoding /BaseFont /NEPCJK+Helvetica /FontDescriptor 71 0 R >> endobj 73 0 obj << /Type /Font /Subtype /Type1 /FirstChar 0 /LastChar 121 /Widths [ 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 278 333 474 556 556 889 722 238 333 333 389 584 278 333 278 278 556 556 556 556 556 556 556 556 556 556 333 333 584 584 584 611 975 722 722 722 722 667 611 778 722 278 556 722 611 833 722 778 667 778 722 667 611 722 667 944 667 667 611 333 278 333 584 556 333 556 611 556 611 556 333 611 611 278 278 556 278 889 611 611 611 611 389 556 333 611 556 778 556 556 ] /Encoding /WinAnsiEncoding /BaseFont /NEPCGG+Helvetica-Bold /FontDescriptor 74 0 R >> endobj 74 0 obj << /Type /FontDescriptor /Ascent 718 /CapHeight 718 /Descent -207 /Flags 262176 /FontBBox [ -170 -228 1003 962 ] /FontName /NEPCGG+Helvetica-Bold /ItalicAngle 0 /StemV 140 /XHeight 532 /StemH 140 /CharSet (��\nm������� \rD��`ϻ���&��tH|��ܖ�x�vI#y�G��`5rwִ���6����O�={\ �Ԍ��$-tC�P�t�eHή��I@|۲��sĂMj.v�����\ ���==_VC`:�e��=�e�6��X���������T) /FontFile3 77 0 R >> endobj 75 0 obj << /Type /Font /Subtype /Type0 /BaseFont /ShinGo-Bold-Identity-H /Encoding /Identity-H /DescendantFonts [ 82 0 R ] >> endobj 76 0 obj << /Length 2503 /Filter /FlateDecode >> stream Each photosite corresponds to an individual pixelin the fin… If a photon, whose energy exceeds the energy of the gap, is absorbed in the depletion zone, it creates an electron-hole pair. sometimes dictated by the available bandwidth (e.g., wireless camera), and higher frame rates are required for many industrial and military applications EE 392B: CCDs { Part I 2-3. 1. A CCD uses a thin silicon wafer chip. During the readout operation, electrodes are alternately biased with high and low voltages to transfer charge down the array. CCDs Galore. CCD readout Schematic of typical 3-phase operation. The digital camera, incorporating a charge-coupled device (CCD) detector, is by far the most common image capture mechanism employed in present-day optical microscopy. All of the electrodes in the … The chip is divided into thousands or millions of tiny light sensitive squares (or sometimes rectangles) called photosites. – Readout: CCD and analog -to-digital converter . vice or CCD make use of this effect (Fig.1). Light Spectrum . ���b�Y"N-_1Ϋ$�J�)?,I>��U�@�+��|��6���ʸ�a,;�.���^.�?�v�r���;߲!�26F�.i[�HM����-$��{�U���;)�*�����C�lo&�b\����&��'��:�׫���u� How It Works: The Charged-Coupled Device, or CCD by Courtney Peterson, Georgetown University Courtney Peterson is the current Editor in Chief of JYI and is a third-year biology and physics major at Georgetown University. HOW A CHARGE COUPLED DEVICE (CCD) IMAGE SENSOR WORKS where the charge is converted to a voltage. %PDF-1.4 %���� Thermal detectors capitalize on the rise in temperature of a material that occurs with the absorption of a photon. We will then deal with electron-multiplication cameras by describing the principles of ICCD, EB-CCD and EM-CCD cameras. Although the charge-coupled device detector functions in an equivalent role to that of film, it has a number of superior attributes for imaging in many applications. [���bL�>�S?�'�� ��b��Z]��I�^����6 �? S�a~�6�? 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In this article, written for a non-specialized audience, she explains what a CCD is, how it works, and why it is so important. A CCD (charge-coupled device) is an electronic instrument for detecting light. ''�`��+Q�a�?/��.W��F����U�%cɏp��#� ]\��.��8J��V'A.�Z�}��ʠ�dbPR4f �J��yd7k�'!AE�^�[iP D�J��@sK}��xu�M�'8��ڮ���/X"�����*��$C'['T�̎���H{vK�vDlvW�ʡ�]R�-�q�B�9��¾2�4�օ�Ρ�*hdfj$)���r���jS��۪&����ԕ�Ԡ���J���{�)L�]��§���:hH���T{$~���x�'��>‚ڢ{y)��4��(_I�ԙ��/�i�9O3z��4�8���V��֏.

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