| 摘要 |
<p>A distance measuring apparatus and a distance measuring method that enable high-precision and high-speed measurement by canceling variations of a delay circuit in the distance measuring apparatus are provided. In the apparatus and the method, light emitted by a light source section 10 in a pulsed manner is branched into first reference light r1, second reference light r2, and transmitted measurement light mt, and the difference in detection time among the first reference light r1 having propagated through a first reference light path R1 which causes substantially no optical variations, the second reference light r2 having propagated through a second reference light path in which an optical delay generating section 50 is inserted, and received measurement light mr returning from an object to be measured 160 as a result of radiating the transmitted measurement light to the object to be measured 160 is measured to measure the distance from the object to be measured 160. In the case where the received measurement light mr and the first reference light r1 are temporally separate from each other, the distance is calculated from the difference in detection time between the received measurement light mr and the first reference light r1. In the case where the received measurement light mr and the first reference light r1 are not temporally separate from each other, a distance L is calculated from a difference in detection time Td between the first reference light r1 and the second reference light r2 and a difference in detection time Td' between the received measurement light mr and the second reference light r2.</p> |
