Measurement-distance correction method, distance measuring device, and distance measuring system

A distance measuring device that measures a distance to a target object on a basis of time of flight of light, the distance measuring device comprising:

• a light emitting section that emits irradiation light toward the target object;
• a light receiving section that detects reflected light from the target object;
• a light-emission control section that controls the light emitting section;
• a distance computing section that calculates the distance to the target object on a basis of time of flight of the reflected light detected at the light receiving section;
• and
• a distance correcting section that uses a correction formula, and corrects the distance calculated at the distance computing section,
• wherein the correction formula is an approximation formula created in advance for converting a measurement value L2 to a set value L1 on a basis of a relationship between a plurality of values of the set value L1 and a plurality of values of the measurement value L2, the set value L1 being a distance of a measurement sample from the distance measuring device, the measurement value L2 being a measurement value of measurement of a distance to the measurement sample by the distance measuring device.

A distance measuring system comprising:

• a distance measuring device that measures a distance to a target object on a basis of time of flight of light;
• and
• an external processing device that corrects a measurement distance measured by the distance measuring device,
• wherein the distance measuring device has:
• a light emitting section that emits irradiation light toward the target object;
• a light receiving section that detects reflected light from the target object;
• a light-emission control section that controls the light emitting section;
• and
• a distance computing section that calculates the distance to the target object on a basis of time of flight of the reflected light detected at the light receiving section;
• and
• the external processing device has:
• a distance correcting section that uses a correction formula, and corrects the distance calculated at the distance computing section of the distance measuring device,
• wherein the correction formula is an approximation formula created in advance for converting a measurement value L2 to a set value L1 on a basis of a relationship between a plurality of values of the set value L1 and a plurality of values of the measurement value L2, the set value L1 being a distance of a measurement sample from the distance measuring device, the measurement value L2 being a measurement value of measurement of a distance to the measurement sample by the distance measuring device.