Laser scan micrometer is a type apply in precise measure of optical scan tech.

激光扫描测微仪是光学扫描技术在精密测量中的典型应用。

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Crist said he hopes to have all the state's touch-screen machines replaced by optical scan systems in time for next year's presidential election.

NPR: Florida Move Would Back Up Electronic Voting

The solution: Smith advocates an optical scan system where voters fill out a paper ballot that's subsequently scanned to create a digital vote.

FORBES: Magazine Article

The county didn't have enough time to purchase optical scan machines for each polling place, which would have helped to detect errors on the spot, giving voters a chance to correct them.

NPR: Ohio's New Voting System Revs Up for Primary