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A charge-coupled device (CCD) is a semiconductor image sensor that turns incoming light into electrical charge, then transfers that charge through the sensor to be measured. The measurements represent the brightness at individual pixel locations and can be assembled into an image. “Charge-coupled device” is the standard technical name; “charged coupled device” is a common search phrasing.
What does CCD stand for?
CCD stands for charge-coupled device. In a camera or imaging instrument, it usually refers to the sensor that detects light—not to the complete camera. A camera system also needs optics to focus an image onto the sensor and electronics to read its measurements and produce image data. NASA’s overview of CCD and CMOS image sensors describes this sensor role.
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How does a CCD sensor work?
- Light reaches the sensor. Optics focus the scene onto photosensitive regions associated with the sensor’s pixels.
- The sensor collects charge. When light is absorbed in the semiconductor, it creates electrical charge carriers. The charge accumulated at each pixel during exposure corresponds to the light received there.
- Charge moves toward the output. During readout, controlled electrical signals shift each pixel’s charge packet through the array toward an output register and amplifier.
- Electronics measure the charge. The output circuit converts the charge into an electrical signal corresponding to pixel brightness. Those measurements can then be assembled into an image.
The transfer is sometimes compared to a bucket brigade: each pixel passes its charge along until it reaches the readout electronics. The analogy is about the sequence of transfer; inside the device, controlled voltages move electrical charge. NASA/JPL explains the bucket-brigade analogy, while a NASA technical report describes CCD structure and operation.
How is a CCD different from CMOS?
The main architectural difference is how each sensor reads pixel signals. A CCD transfers accumulated pixel charge to an output amplifier. In a CMOS active-pixel sensor, amplification and readout are associated with individual pixels, allowing pixels to be read directly. NASA notes that CCDs can provide image quality suited to scientific use, while their charge transfer requires power and efficient operation; its comparison describes CMOS as reducing power needs and charge-transfer concerns. These are architectural trade-offs, not a universal ranking: performance depends on the application, sensor design, and generation. NASA’s CCD-versus-CMOS explanation covers the comparison.
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Where are CCDs used?
CCDs are used in scientific imaging, including astronomy and spacecraft instruments. They can be made as two-dimensional arrays or as a single line of detector pixels. A line detector can build a two-dimensional image as the scene moves past it—for example, as a spacecraft travels over a planetary surface. The exact arrangement depends on the imaging instrument. NASA’s spacecraft-detector chapter describes these detector forms and uses.
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