Abramovich's laser shield, trying to figure out how it works
Only a lazy news agency did not write about the new yacht Roman Abramovich Eclipse .
I cannot admire its size. It just doesn't fit my head. 170 meters is no longer a yacht, but some kind of barge.
')
Interesting is another. The ship has a laser photo counter and film shooting system. For example, habrauzer alizar in his post writes that:
“The system consists of infrared lasers, which scan the surrounding territory for the presence of CCD sensors, and a light gun that instantly burns out the sensor if it is detected ...”
The English magazine Amateur Photographer has already attended to the legal legality of such a system.
On the forum of the magazine, one of the users writes that such devices already exist. They are installed in cinemas to prevent illegal filming from the hall, that is, the production of “screen”. However, he doubts the effectiveness of such systems, since the number of "screen" does not decrease.
A little googling, I came to the conclusion that technically such a system is quite real. Well, except that “burning the matrix” seems to me an exaggeration of journalists. Not because of the impossibility of implementation, but in the sense of danger to humans. This is most likely about the flare of the current frame.
Next, I provide my assumptions about the principle of operation of such a system.
For the detection of cameras it is possible to use, for example, a lidar , the so-called “laser radar”. In the classic version, it is used as an active optical range finder. That is, the fact of reflection is recorded and the time for which the signal has returned is measured. However, if the reflectivity of the scanned object is noticeably different from the reflectivity of the background, then by changing the intensity of the return signal, you can detect the specified object.
The principle of the CCD (CCD), among other things, includes the following point:
... the combination of voltages on the electrodes creates a potential well in which electrons can accumulate ...
That is, it can be assumed that the reflectance of the CCD is noticeably (by a registered and approximately known value) different (obviously, in a smaller direction) from the reflectance of plastic and other background. With the help of this fact it can be identified. Based on this assumption, it becomes clear why CMOS matrices (CMOS), whose working principle is different, are not detected.
Further, having “stumbled” in the process of scanning onto a CCD array, the system needs only to increase the radiation power in order to illuminate the frame. There is simply no so-called light gun. Search and "destruction of the enemy" is made by one beam.
Thus, the problems of the system response speed are eliminated, causing doubts in many habrayuser, who commented on the previous post . This also solves the problem of false positives, for example, on the glare of glasses.
Therefore, the system is likely to really exist. And we will soon find out about its effectiveness. The yacht is planned to be delivered to the customer at the end of this year.
Upd:
Habrayuzer YasonBy in the comments cited a link ( pdf ) to the 2005 article on the University of Washington Computer Science & Engineering website about the idea of ​​such a system.
Habroche formulated the principle of camera detection as follows:
"The reflectivity of a CCD (CMOS) matrix is ​​noticeably different (obviously, in a big way because of the phenomenon of reverse (retroreflective) reflection, which occurs because the matrix is ​​located in the focal plane of the camera's optical system) from the reflectivity of the plastic and other background . With the help of this fact it can be identified. It does not matter what type of matrix is ​​used, since the system’s work is not based on the features of a particular type of matrix, but on the features of the structure as a whole. ”
The author considers the principle of work given in the comments to be more technically plausible.
I cannot admire its size. It just doesn't fit my head. 170 meters is no longer a yacht, but some kind of barge.
')
Interesting is another. The ship has a laser photo counter and film shooting system. For example, habrauzer alizar in his post writes that:
“The system consists of infrared lasers, which scan the surrounding territory for the presence of CCD sensors, and a light gun that instantly burns out the sensor if it is detected ...”
The English magazine Amateur Photographer has already attended to the legal legality of such a system.
On the forum of the magazine, one of the users writes that such devices already exist. They are installed in cinemas to prevent illegal filming from the hall, that is, the production of “screen”. However, he doubts the effectiveness of such systems, since the number of "screen" does not decrease.
A little googling, I came to the conclusion that technically such a system is quite real. Well, except that “burning the matrix” seems to me an exaggeration of journalists. Not because of the impossibility of implementation, but in the sense of danger to humans. This is most likely about the flare of the current frame.
Next, I provide my assumptions about the principle of operation of such a system.
For the detection of cameras it is possible to use, for example, a lidar , the so-called “laser radar”. In the classic version, it is used as an active optical range finder. That is, the fact of reflection is recorded and the time for which the signal has returned is measured. However, if the reflectivity of the scanned object is noticeably different from the reflectivity of the background, then by changing the intensity of the return signal, you can detect the specified object.
The principle of the CCD (CCD), among other things, includes the following point:
... the combination of voltages on the electrodes creates a potential well in which electrons can accumulate ...
That is, it can be assumed that the reflectance of the CCD is noticeably (by a registered and approximately known value) different (obviously, in a smaller direction) from the reflectance of plastic and other background. With the help of this fact it can be identified. Based on this assumption, it becomes clear why CMOS matrices (CMOS), whose working principle is different, are not detected.
Further, having “stumbled” in the process of scanning onto a CCD array, the system needs only to increase the radiation power in order to illuminate the frame. There is simply no so-called light gun. Search and "destruction of the enemy" is made by one beam.
Thus, the problems of the system response speed are eliminated, causing doubts in many habrayuser, who commented on the previous post . This also solves the problem of false positives, for example, on the glare of glasses.
Therefore, the system is likely to really exist. And we will soon find out about its effectiveness. The yacht is planned to be delivered to the customer at the end of this year.
Upd:
Habrayuzer YasonBy in the comments cited a link ( pdf ) to the 2005 article on the University of Washington Computer Science & Engineering website about the idea of ​​such a system.
Habroche formulated the principle of camera detection as follows:
"The reflectivity of a CCD (CMOS) matrix is ​​noticeably different (obviously, in a big way because of the phenomenon of reverse (retroreflective) reflection, which occurs because the matrix is ​​located in the focal plane of the camera's optical system) from the reflectivity of the plastic and other background . With the help of this fact it can be identified. It does not matter what type of matrix is ​​used, since the system’s work is not based on the features of a particular type of matrix, but on the features of the structure as a whole. ”
The author considers the principle of work given in the comments to be more technically plausible.
Source: https://habr.com/ru/post/71615/
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