Distance measurement by means of a modulated light beam yet independent of the speed of light
Tài liệu tham khảo
K. D. FROOME and R. H. BRADSELL: J. sci. Instrum., 1961,38, 458.
R. H. BRADSELL: Trans. Soc. Instrum. Tech., 1964,16, 30. The following British patent applications are involved: 919368; 44480/63, 4564/64, 7473/64, 7687/64, 7858/64 and the cognated version of these.