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    You can search "Special God of War" in Baidu to find the latest chapter!

    After going over Liu Yi¡¯s statement seriously in his mind, the field captain nodded and said, ¡°Don¡¯t talk about it, it¡¯s really possible!¡±

    The criminal investigation expert sitting next to him also nodded slightly, but still had some doubts.

    He frowned and thought for a while, then said: "That's too weird"

    Let¡¯s not talk about anything else. As far as the greening in the courtyard is concerned, there are big and old trees everywhere.  Although there are no leaves at this time, the density of the tree crown is not low.

    ??You can see everything by flying twice in the sky at night?  "

    Criminal investigation experts must be experts in criminal investigation.

    However, due to the limitations of contact with cases, technical aspects are not omniscient and omnipotent.

    After hearing the other party¡¯s doubts, Liu Yi explained: ¡°Because it is night, it is easier for the drone to understand the comprehensive situation in the yard.¡±

    When I saw the criminal investigation experts and the people in the room, they all looked at me and waited for an explanation.

    Liu Yi straightened his sitting posture and said: "If my guess is correct, the drone used by the other party to investigate the environment must be equipped with a surveillance camera.

    And, since it is used at night, it must be a surveillance lens with night vision function.  "

    Everyone can understand this. Drones are not remote-controlled airplanes for children to play with.

    When working in a beyond visual range environment, a surveillance camera must be installed.

    Equipment with night vision functions is not new. Most surveillance cameras commonly seen on the street have night vision functions.

    There are also cameras used for video chatting on computers, many of which also have night vision capabilities.

    Seeing everyone nodding in agreement, Liu Yi continued: "The night vision function we often talk about can be implemented in two ways.

    ? One is active infrared sensing, and the other is passive infrared sensing.

    Active infrared is mostly seen in our common security cameras or outdoor surveillance cameras.

    If you look carefully, you will find that there will be one or more rows of small light bulbs on both sides of the lens of this kind of camera.

    Although you can¡¯t see these light bulbs emitting light most of the time, if you look carefully at night, you will find that there is a low-intensity red light emitting.

    The lens generates images by capturing the reflection of these red lights.  "

    "What about being passive?" the young policeman couldn't help but interjected and asked.

    As a result, the field captain glared at me again.

    Liu Yigang was about to continue when he noticed a fat man in his late forties and wearing a thick jacket passing by the window.

    Then the man pushed the door open and entered the house. Seeing the people in the house getting up one after another, he waved his hands casually.

    After sitting down in the corner, he motioned for Liu Yi to continue speaking.

    The other party¡¯s behavior shows that he must be a leader.

    But no matter how big an official the other party is, it has nothing to do with Liu Yi.

    So, his face changed color and he continued what he had said before: "If I guessed correctly, the drone is equipped with a passive infrared sensor lens.

    The thermal imaging technology we often talk about is actually passive infrared sensing.

    The principle is that any object with a temperature higher than absolute zero will produce black body radiation.

    The higher the temperature, the stronger the radiation and the shorter the radiation wavelength.

    The body temperature of our human body and animals is about 37 degrees. The radiation wavelength of objects at this temperature is just in the infrared region.

    Passive infrared imaging takes advantage of this feature.  "

    A drone equipped with a passive infrared lens flies over the dry rest house at night.

    In the captured images, buildings, asphalt roads, trees, and human bodies all reflect different wavelengths.

    Therefore, the other party can clearly grasp all the information within the scope.

    ¡°Moreover, all the surveillance cameras in the dormitory have been recently replaced, and all have night vision functions"

    The young police officer clenched his fists excitedly and said loudly: "They can use the infrared light emitted by the surveillance cameras to figure out the surveillance angle of each camera.

    So you can accurately find out the monitoring blind spots!  "

    This time, the field captain did not glare at his subordinate who was trying to steal the words. He followed Liu Yi's train of thought and thought for two seconds.

    "This kind of drone must have a remote control distance limit," he said thoughtfully. "So they probably went around the perimeter first to investigate the internal situation of the dry rest house.

    Through the characteristics of our field defense and the distribution of surveillance cameras, we can determine the location of Academician Qin.

    Then, through the monitoring of the masterDamn it, our logistics department definitely doesn¡¯t have it.  The field team captain curled his lips and shook his head, muttering: "If you want to play both, you will probably have to ask for it from the Thirteenth Bureau."  "

    The middle-aged man¡¯s eyes widened when he heard this. The Thirteenth Bureau is the department under the General Administration responsible for the management and research and development of investigative technology equipment.

    From where to get the equipment, is it easy to get it?

    ¡°It¡¯s a lot of effort just to write a report and explain the reasons, and then go through all the layers of approval. It¡¯s still unclear whether it will be approved in the end.

    "Ten thousand steps back, even if it is approved, it will not be obtained in a day or two."

    The middle-aged man was thinking that it would be too late to work hard, when his mind suddenly moved.

    He hesitated and asked the field team leader: "Do those two things have practical value?"

    "Why not!" The field captain instantly understood the leader's intention.

    He lowered his voice and said: "Full-band sniffing equipment can basically capture any current wireless signal, regardless of whether it is digital or analog.

    With that thing, it will be much easier for us to lock down a suspect or something.

    ? emp is more useful. If you encounter a fleeing vehicle in the future, aim at it and stop it immediately, no matter what vehicle it is.

    There are also electronic devices such as mobile phones and computers, and the whole family goes there to have a rest.

    Let me tell you this, both of them are very practical technical equipment.  "

    "Expensive?" the middle-aged man asked tentatively.

    "Expensive! Expensive! Otherwise, the superiors would have distributed it to each unit." The field captain replied through gritted teeth.

    ¡°I¡¯ll report to the superiors when I get back!¡± the middle-aged man made up his mind.

    ¡°That thing is not easy to approve.¡± The field team captain said with a slap in his face.

    "It's not easy to approve? What's the use of the points!" The middle-aged man sneered, put his hands behind his back and said proudly: "As for the current case, as long as the ministry has it, what can't be approved?

    ¡°Besides, it¡¯s not what we need.  He's the comrade in charge of security, so he needs to be called by name.  "

    "Then I guess you can borrow it from me temporarily." The field captain continued to pour cold water on the leader.

    "What's wrong with borrowing?" The middle-aged man said confidently: "Whether you want to borrow or not is decided by the higher-ups.

    "If you don't pay it back yet, when you will pay it back, the initiative is not in our hands."  "

    "Excellent leadership!" The field team captain looked like a dog-legger and gave a thumbs up with admiration on his face.

    Of course he was happy. If he really wanted to get the equipment, he would have to use it in the field first.

    While the leader was happy, the field team captain whispered: "Boss, what's the background of those security guards?"

    ¡°Why do you ask this?¡± The middle-aged man put on a leadership air.

    "NoI'm just curious. Our people, together with the veteran criminal investigators supported by the municipal bureau, wandered around the courtyard and found nothing.

    That kid just made a circle and drew out the path his opponent took.

    ??Also, as for the drone thing, we have only seen it in foreign blockbusters, but he can actually think of it.

    "You know what to deal with when you open your mouth. This is not something you can learn from watching movies."  "

    "Hmph~" the middle-aged man said in a tone of educating his younger generation: "There are many capable people, so let's learn a little bit."

    After finishing speaking, he reminded as he walked out: "Don't pry around, learning the confidentiality rules will be in vain" (Remember the website address: www.hlnovel.com
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