BOSTON, Sept 8 (Reuters) - A Chinese businessman was sentenced on Wednesday to two years in prison after admitting that he illegally exported marine technology with uses in anti-submarine warfare from the United States for the benefit of a Chinese military university. Shuren Qin, who founded a company that sold oceanographic instruments, was sentenced by U.S. District Judge Denise Casper in Boston after admitting he illegally exported devices called hydrophones that can be used to monitor sound underwater. Prosecutors had sought 7-1/2 years in prison for Qin, who must also pay a $20,000 fine. His guilty plea was conditional, allowing him to appeal a ruling by Casper to not suppress the evidence against him. The marine biologist was charged in 2018 amid rising U.S. concerns about China"s national security threat, a continued focus of the Biden administration. Qin, 45, had already served three months in jail after his arrest. Defense lawyers said he founded LinkOcean Technologies Ltd in China in 2005 to provide oceanographic instruments to scientists, and immigrated to the United States with his family in 2014 as a permanent resident. Prosecutors said Qin from 2015 to 2016 exported hydrophones to Northwestern Polytechnical University, a Chinese military research institute involved in underwater drone projects, by deceiving a U.S. supplier and without obtaining export licenses. His lawyers say Qin was unaware of the university"s intended purposes for the products, which also had civilian, scientific uses. "These are not top-secret technologies," said Qin"s lawyer, Sara Silva. Qin, who lives in Wellesley, Massachusetts, in the Boston area pleaded guilty in April to 10 counts, including conspiring to commit export violations, visa fraud, money laundering and smuggling. Prosecutors originally also accused Qin of exporting unmanned surface vehicles and robotic boats, and alleged he supplied $8 million in goods to Chinese government-controlled entities. He instead only admitted to charges concerning 60 hydrophones worth $100,000.