Chinese scientists develop handheld sonic weapon for crowd control

South China Morning Post 發布於 2019年09月19日16:09 • Stephen Chen
  • Gas-powered device passed for mass production after two years of research
A Los Angeles police officer stands by a sound cannon at a demonstration in Anaheim – Chinese scientists say they have taken the technology to a new level. Photo: AFP

China has developed the world's first portable sonic gun for riot control, the Chinese Academy of Sciences said.

The rifle-shaped instrument, which was jointly developed with military and law enforcement, is designed to disperse crowds using focused waves of low frequency sound, the academy's Technical Institute of Physics and Chemistry website said on Wednesday.

The device's "biological effect" would cause extreme discomfort, with vibrations in the eardrums, eyeballs, stomach, liver, and brain, scientists said.

Studies dating to the 1940s found that low frequency sound energy could, depending upon intensity and exposure, cause dizziness, headaches, vomiting, bowel spasms, involuntary defecation, organ damage and heart attacks.

Professor Xie Xiujuan discusses the portable sonic rifle (circled) with the government science panel sent to evaluate it. Photo: CAS

Sonic weapons are typically large and have to be mounted on vehicles. Until the Chinese development, which has no moving parts, they were powered by electricity to drive a magnetic coil to generate energy. This meant they needed a large and stable source of power.

The Chinese government launched the sonic weapon programme in 2017 and its conclusion is unlikely to be related to the months of anti-government protests in Hong Kong.

Professor Xie Xiujuan, lead scientist on the project, said the device was powered by a tube-shape vessel containing an inert gas. When heated, the gas particles vibrate and a deep, monotonous sound is emitted.

The prototype had passed field and third-party tests and the project team has completed its assessment of the device's effects on the body, the academy said.

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On September 4, a panel of scientists and engineers representing the Ministry of Science and Technology met in Beijing and approved a design developed by Xie's team for mass production.

"The panel suggested that the fruit of the project should be transformed into practical equipment as soon as possible," the academy said.

In a photograph on the institute's website, the device could be seen on a meeting room table as the experts deliberated. It looked similar to a rifle, with a stock, trigger and barrel.

A protester looks at an acoustic crowd dispersal device during a demonstration outside Poland's ministry of economy building in Warsaw. Photo: Alamy

Xie refused to reveal details of the device's frequency or its effective range. She also declined to comment on its uses without approval from higher authorities.

So far, there have been no reports of Chinese soldiers or law enforcement officers using such equipment.

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