What is a super high sensitivity camera

What is an ultra-high sensitivity camera? What are its advantages and disadvantages?

Answer: "EX-View" is a sensitivity improvement technology developed by Sony Corporation to improve the sensitivity of its CCD. One is two visible light factors, and the other is four times the wavelength of near infrared waves.

EX-View is Sony's proprietary technology. The P / N interface of each CCD-based photodiode is specially assembled to obtain better photon-to-electron conversion efficiency. In addition, each photodiode (depicting a pixel on the image) has a micro lens overlaid to better record and focus light to an effective semiconductor interface. Compared with the CCD viewing range provided by Sony, its results have increased the sensitivity of visible light by 2 times and near infrared light (800 to 900 nm) by 4 times. The Lux efficiency of EX-View is 2 times higher than the high-quality "Super HAD" visible and near-infrared wave fields.

The drawback of EX-View technology is that, because of the difficult nature of the CCD chip manufacturing process and the sensitive nature of the chip, Sony has only a limited supply of sensors.

According to Sony, there are some potential imperfections in the photodiode of the EX-View chip compared to the Super HAD sensor. These few defective CCD elements may be faulty, which will result in "dead pixels", leaving some white or black spots in the image that cannot be removed. CCD chips are known to continue to grow in dead spots whether they are stored or used.

For example, an EX-View CCD from a Sony factory has only 3 dead spots, but it may increase to 5 during transportation, and may increase to 7 when it reaches the warehouse of the camera manufacturer and will continue to grow. For example, When installed on a CCD camera, it grows to 12. By the time the camera reaches the user, the number may grow to 15 to 30. This process will continue until the defective photodiodes have stabilized. Sony believes that the reason for the increase in the number of dead spots is that cosmic rays have damaged some defective interfaces of the CCD matrix.

Due to the photosensitive nature of the manufacturing process, the output of the EX-View CCD chip is relatively low, and the available units are also limited. The high cost combination of the manufacturing process makes the EX-View CCD chip more suitable for special fields (such as scientific research and industry). It is very important to use a high-sensitivity chip here, but it is not used in ordinary surveillance camera applications. Cost-effective.