A laser rangefinder is a rangefinder which uses a laser beam to determine the distance to an object. The most common method of the distant measurement is time of flight principle by measuring the time from sending a laser pulse towards the object and to returning back to the sender.
Pulsed laser diodes and detectors (PIN-PD, APD, MPPC) from Hamamatsu have been in use in the laser rangefinder.
|Operation voltage||to several tens of V||100 to 200 V||to 10 V|
|Gain||105||10 to 100||1|
|Ambient light immunity||Medium||Medium||High|
|Uniformity||Good||Depends on the size||Good|
Basic detectors for rangefinders, photodiodes are suitable for short range measurement under high ambient light conditions. Their lower cost and lower voltage operation are advantageous for rangefinders. The S13773 is sensitive from the visible region to 1100 nm, and has a high-speed response of 500 MHz. Its JEDEC level is 2a.
An APD can measure longer distances than a PIN-PD, and has high sensitivity at 900 nm.
Also available is an APD series with a bandpass filter that blocks background light, which improves the accuracy of distance measurements.
An MPPC is a device having multiple APD pixels operating in Geiger mode.
Its excellent sensitivity, which can detect extremely weak light at the photon counting level, is suitable for long range measurement.
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