1535nm Laser Rangefinder -8K15

Type: LRF-406

Short Description:

Maximum range: 8km

Divergence：≤0.3mrad

Weight: ≤140g

LRF-406 is a high-precision laser rangefinder module made out of erbium glass lasers that developed by Erbium Tech. It is a device to determine distance to an object by detecting return signal of laser pulse.

Its raw materials including erbium glass and erbium glass laser are both developed and researched by Erbium Tech. With mature technology and stable performance, it can determine distance not only to static objects but also to dynamic objects and can be set on various equipment to achieve wide range of application.

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Product Detail

Communication interface

Calculation of ranging ability

Dimension

Product Tags

Parameters

Parameters	Specification	Note.
Wavelength	1535±5nm
Ranging capability	50m~8km
Ranging ability	≥8km(2.3m×2.3m, 0.3 reflectivity vehicle, visibility≥10km)	Humidity≤80%
Ranging ability	≥12km(for large targets, visibility≥15km)	Humidity≤80%
Ranging accuracy	±3m
Ranging repetition rate	1~10hz(adjustable)
Accuracy	≥98%
Divergence angle	≤0.3mrad
Receiving aperture	40mm
Communication interface	RS422
Supply voltage	DC18~32V
Operating power	≤2W(@1hz)	Tested under room temperature
Stand-by power	≤0.5W	Tested under room temperature
Dimension	≤86mm×66mm×46mm
Weight	≤140g
Temperature	-40℃~65℃
Heat-dissipating	By thermal conduction

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Line NO.	Definition	Note.
1	RS422 RX+	RS422 receive+
2	RS422 RX-	RS422 receive-
3	RS422 TX-	RS422 Transmit-
4	RS422 TX+	RS422 Transmit+
5	GND	For Communication interface
6	+24V	Power supply 24V
7	GND	For power supply
8		For spare

Targets and condition requirements

Visibility≥10km

Humidity≤80%

For vehicles with 2.3m×2.3m dimension

Reflectivity=0.3

Ranging ability≥8km

Analysis and verification

The main parameters that affect ranging ability are peak power of lasers, divergence angle, transmitting and receiving transmittance, wavelength of laser, etc.

For this laser rangefinder, it takes≥50kw peak power of lasers, 0.3mrad divergence angle, 1535nm wavelength, transmitting transmittance≥90%, receiving transmittance≥80% and 40mm receiving aperture.

It is a laser rangefinder for small targets, ranging ability can be calculated by the following formula. Ranging formula for small targets：

As long as detectable optical power that reflected by targets is larger than minimum detectable power, a laser rangefinder is able to range distance to a target. For a laser rangefinder with 1535nm wavelength, generally, the minimum detectable power(M.D.S) of APD is 5×10^-9W.

Under 10km visibility with 10km distance to targets, the minimum detectable power is lower than M.D.S of APD(5×10^-9W), therefore, under a condition with 8km visibility, a laser rangefinder can range distance for (2.3m×2.3m) targets up to 9~10km(might be close or less than 10km).

1570nm laser