Background of Laser Rangefinders
The first practical laser rangefinders were developed in the early 1960s, shortly after the invention of the laser in 1960 by Theodore Maiman in the United States. The initial goal was mainly military applications, such as measuring distances for artillery and targeting.
​
Early systems did not use the compact, handheld designs we have today. Instead, they were large, laboratory-sized devices that relied on pulsed lasers.
Here’s how they worked back then:
-
A laser pulse was emitted toward a distant object.
-
The device measured the time it took for the light to bounce back (time-of-flight principle).
-
Distance was calculated using the speed of light, which is constant: Distance = (Speed of light × Time) ÷ 2.
​
The ÷ 2 accounts for the round trip of the laser pulse. Early units could measure distances of a few kilometers with accuracy of a few meters, impressive for the time but far less precise than modern devices.
​
The first commercial and military applications appeared in the late 1960s and early 1970s. Military versions were mounted on tanks, ships, and aircraft, while surveyors began experimenting with them for land mapping and construction.
Laser Rangefinder
A laser rangefinder measures the distance to an object by sending a laser beam and calculating how long it takes to return. It’s fast, accurate, and used in surveying, construction, hunting, and security.
Explore More Core Technologies
What is a Laser Rangefinder?
Definition:
A laser rangefinder typically consists of a laser emitter, a receiver, and a microprocessor. The laser emitter sends out a pulse of laser light, which hits the target and bounces back towards the receiver, which detects the returning light. The time it takes or phase shift for the pulse to travel to the target and back is measured by the microprocessor, which then calculates the distance to the target using the speed of light in the time-of-flight method or using the speed of light, phase change, and modulation frequency in the phase shift method.
(Source: Wavelength)
Facts About Laser Rangefinder
Laser rangefinders measure distance by sending a laser pulse to a target and timing how long it takes to bounce back, essentially measuring the speed of light with extreme precision. Modern devices use infrared lasers and highly sensitive sensors, allowing them to detect even faint reflections for accurate readings over short and long distances.
Advanced models fire multiple pulses per second, filter out sunlight and background interference, and compensate for temperature, humidity, and air pressure, maintaining accuracy in nearly any environment. Some cutting-edge units even use frequency-modulated lasers, which can measure multiple distances at once with remarkable precision.
Many devices go beyond distance measurement, offering angle calculation, speed detection, ballistic guidance, and GPS integration, making them powerful tools for hunting, surveying, forestry, security, and tactical operations. Lightweight, durable, and eye-safe, laser rangefinders combine precision, speed, and versatility in a compact handheld design.
