ccd camera is not a film camera, it is a digital camera; CCD with grid-arranged pixels is used in the photosensitive components of digital cameras, optical scanners and video cameras; its light efficiency can reach 70%, which is better than traditional 2% of film, so CCD quickly gained widespread adoption by astronomers.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
Is the ccd camera a film camera?
no.
CCD camera:
CCD camera is in the security system. The generation of images currently mainly comes from CCD camera. CCD is a charge coupled device. The abbreviation of CCD can convert light into electric charge, store and transfer the electric charge, and can also take out the stored electric charge to change the voltage. Therefore, it is an ideal CCD camera element. The CCD camera composed of it has the characteristics of small size, light weight, It is not affected by magnetic fields and is resistant to vibration and impact and is widely used.
Principle Application
CCDs containing pixels arranged in a grid are used in photosensitive components of digital cameras, optical scanners and cameras. Its light efficiency can reach 70% (can capture 70% of the incident light), which is better than the 2% of traditional film. Therefore, CCD has quickly been widely adopted by astronomers.
Linear CCD used in fax machines
After the image is imaged on the surface of the capacitor array through the lens, charges of varying strengths are formed on each capacitor unit according to its brightness. A linear CCD used in a fax machine or scanner captures a slender strip of light at a time, while a flat CCD used in a digital camera or video camera captures an entire image at once, or cuts out a square area from it. Once the exposure action is completed, the control circuit will transfer the charge on the capacitor unit to the next adjacent unit. When it reaches the last unit on the edge, the electrical signal is transferred to the amplifier and converted into a potential. This goes on and on until the entire image is converted into electrical potential, sampled and digitized, and then stored in memory. Stored images can be transferred to a printer, storage device or display screen. Frozen CCDs were also widely used in astronomical photography and various night vision equipment in the early 1990s, and major observatories continued to develop high-pixel CCDs to take extremely high-resolution celestial photos.
CCD has a wonderful application in astronomy, allowing a fixed telescope to function like a tracking telescope. The method is to make the direction of the charge reading and movement on the CCD consistent with the direction of the celestial body, and the speed is also synchronized. Using the CCD guide star can not only effectively correct the tracking error of the telescope, but also enable the telescope to record a larger field of view than the original.
Most general CCDs can sense infrared rays, so infrared images, night vision equipment, zero-illuminance (or approaching zero-illuminance) cameras/cameras, etc. are derived. In order to reduce infrared interference, CCDs used in astronomy are often cooled by liquid nitrogen or semiconductors, because objects at room temperature will have infrared blackbody radiation effects. The sensitivity of CCD to infrared rays causes another effect. If any digital camera or video recorder equipped with CCD is not equipped with an infrared filter, it is easy to capture the infrared rays emitted by the remote control. Lowering the temperature can reduce the dark current on the capacitor array, improve the sensitivity of the CCD in low illumination, and even increase the sensitivity to ultraviolet and visible light (increased signal-to-noise ratio).
Film camera:
Film camera is a traditional camera. Film cameras are divided into single-lens cameras and binocular cameras. Film cameras use film, so in terms of cost, Consumers need to pay for the purchase of negative film, develop it into photos, and the cost of developing the film and photo paper. Calculating the cost of each roll of negative film is about 80 yuan. If it is a reversal film, it is about 80 yuan. Around 130 yuan.
There is not much difference in the working principle between digital cameras and film cameras. They both use the light emitted or reflected by the subject to pass through the lens to form an object image on the focal plane.
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