ALEXANDRIA, Va., Sept. 17 -- United States Patent no. 12,416,487, issued on Sept. 16, was assigned to SEIKO EPSON Corp. (Tokyo).
"Laser interferometer" was invented by Kohei Yamada (Shiojiri, Japan) and Takeshi Shimizu (Chino, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A laser interferometer includes a laser light source that emits laser light, an optical modulator which superimposes a modulation signal on the laser light using a vibrator driven by a drive signal, a photodetector that receives the laser light including a sample signal and the laser light including the modulation signal, and outputs a light receiving signal, an oscillator that generates a reference signal, an amplifier that outputs ...