ORCAⅡは、BT-CCD（背面照射型CCD）を搭載した冷却デジタルCCD カメラです。背面照射型CCD の採用により、紫外から近赤外まで幅広い波長の撮像が可能です。素子をペルチェ冷却することにより、暗電流を抑え画質を向上させるとともに、長時間露光を可能としています。フレームトランスファ型CCD の採用により、メカニカルシャッタが不要で、耐久性に優れています。
|画素サイズ||13 μm（H）×13 μm（V）|
|有効素子サイズ||13.3 mm（H）×13.3 mm（V）|
|飽和電荷量||80 000 electrons（typ.）|
|読み出しノイズ||6 electrons rms（typ.） *4|
|露光時間||内部同期モード：高精度読み出しモード 3.53 s～7200 s *6 *7
内部同期モード：高速読み出しモード 307 ms～7200 s *6
外部同期モード：高精度読み出しモード 400 ms～7200 s *6
外部同期モード：高速読み出しモード 20 ms～7200 s *6
|冷却温度||強制空冷：-65 ℃（周囲温度：0 ℃～+30 ℃） *2
水冷：-75 ℃（水温：+20 ℃） *2 *3
|暗電流||空冷（-65 ℃）：0.0065 electron/pixel/s（typ.）
水冷（-75 ℃）：0.0012 electron/pixel/s（typ.）
|ダイナミックレンジ||13 333:1 *5|
|電源||AC 100 V～240 V、50 Hz / 60 Hz|
|動作周囲温度||0 ℃～+40 ℃|
|性能保証温度||0 ℃～+30 ℃|
|保存周囲温度||-10 ℃～+50 ℃|
|動作周囲湿度||30 % ～ 70 % 強制空冷時 (結露しないこと)|
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