"Eavesdropping": Laser technology makes eavesdropping not "hidden"

The current movie "Eavesdropping" series is hot, but want to eavesdrop on other people's speech, but also climb into the room to install eavesdropping instruments? This move has been "out", a group of college students in the Buddhist Academy spent more than two years inventing the laser sniffer. As long as the room has glass windows, the laser detector will feedback the change of the glass window frequency due to the sound back to the eavesdropping instrument. In the middle, and then through the program "decoding", the person in the room talks as long as more than 30 decibels are monitored by the instrument. It is reported that the sniffer has improved the drawbacks of traditional eavesdropping instruments relying on radar waves to be easily shielded. At present, it has been applied for patents and is also being phased out by enterprises. The invention also won the gold medal in the Guangdong Division of the College Challenger Cup University Competition. Tomorrow, these students will submit their invention materials as representatives of Guangdong university students and participate in national competitions.

Fresh: laser restores the speaker voice in the room

Yesterday at noon, in the basic laboratory building of the headquarters of the Foshan College, the "true volume" of this laser sniffer, this unappealing instrument, looks like a scorpion of about the size of a family kit. But open the lid of the scorpion, but there is "乾坤" inside. On the array board, the laser emitter's rays are transmitted by a plurality of lens groups, and the lens can be directly placed on the window of the room to be tapped through the lens of the dice.

"As long as the people in the room start to speak, the sound is more than 30 decibels, and the outdoor wind does not exceed 5, we can cause the vibration of the glass by detecting the person's speech, and then receive us back through the frequency of this vibration. In the circuit board, through our own program, it is reduced to sound." Lin Chutao, the core of the founding team of the laser bug, and a junior at the Buddhist Academy.

Lin Chutao said that compared with traditional eavesdropping instruments, laser eavesdroppers are difficult to be disturbed because they use lightwave frequencies. The light emitted by the laser sniffer is also invisible to the naked eye, so it is more concealed. What's more, the instrument can be positioned by sound to the specific location of the person in the room.

“At the beginning, I had this idea when I was a freshman. When I talked about the theory of wave optics in the classroom, I thought, can the voice of people speak and be restored by laser?” From a young age to physics and gizmo Lin Chutao, a hobbyist, and a group of students interested in this area began to consult materials and consult teachers.

"The first half of the year was very frustrating, because the theory is like this, but in the process of doing it, I found many difficulties. These can only be slowly pondered by myself, and I have tried many times to find a solution." Lin Chutao said that the instrument was the first. The reflected light waves are not captured at all, and the computer screen is blank.

Eight months later, after repeated debugging, the students in the lab finally showed the shape of light waves on the screen. “The first time we saw it, we were really excited. All the students cheered and celebrated.” Lin Chutao said that after capturing the light wave signal, he also saw the hope that the signal could be received, and then more than a year later. Attempts, the instrument is finally able to receive a clear voice of the person.

Application: used to detect the maturity of melons

It is understood that putting technology inventions into practice is also an important part of the College Challenger Cup Entrepreneurship Competition. Therefore, this team also includes many students from marketing and international trade. "We also thought about the plan, the main object is to sell to legal security companies, or some departments to use, applied in investigation cases according to law." Chen Yunqing, a marketing professional at the Academy of Sciences, said that the invention won the provincial gold medal. I also applied for a patent, which has already attracted the attention of some companies. I specially went to the school to see the instrument and proposed a plan for students to participate in technology.

“In addition to being used for eavesdropping, this technology can also be applied to machine positioning and cutting in industrial production, as well as the maturity of agricultural testing.” According to the team’s instructor, Dr. Liang Peiying, Department of Optoelectronics and Physics, Faculty of Science, For example, when you buy watermelon, you will first tap the watermelon to hear the sound, and judge that this watermelon is not cooked. "The same is true for this instrument. By illuminating the surface of the watermelon and tapping on the watermelon, you can more accurately judge its maturity."

It is reported that due to this invention, many juniors of the team have been in the company in advance and invited them to the company for internship. “Enterprises like students who are capable and creative,” said Dr. Liang Peiying.

Reminder: Eavesdropping privacy violation
Rushing to sell technology or illegal

“It is legal for college students to invent and create a new type of laser sniffer. But if it is used in society or as a new high-tech product package, it needs to be very cautious.” Liang Danguo, lawyer of Guangdong Bangnan Law Firm Remind, because eavesdropping involves personal privacy or trade secrets, according to the relevant provisions of the Public Security Punishment Regulations or the Civil Liability Tort Law, if personal privacy and legal rights are violated, the relevant responsible person's compensation can be traced.

The students said that they have already noticed this. Lin Chutao said with a smile, because the team knows that eavesdropping instruments can't be used casually because they involve the privacy of others. “At most, when listening to the test building, I heard the sound of other classrooms.” Lin Chutao said that due to the particularity of the eavesdropping instrument, it was decided that the instrument could not be used in the private market and would be mainly provided to the joint venture quality security company.

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