AR4000

with measurement capabilities to 17m The AR4000 family of optical distance measuring sensors have a useful range from zero to 17m for most diffuse reflective surfaces. A longer distance, eye-safe version is available for use with reflective tape. These sensors operate by emitting a collimated laser beam that is reflected from the target surface and collected by the sensors. The sensors are suitable for a wide variety of distance measurement applications that demand high accuracy and fast response times.

The AR4000-LIR is a Class IIIb infrared laser sensor with an effective range of 17m and an accuracy of 2,5mm. This instrument is ideal for measuring moving objects of different target materials. It is standard with a 8 mW laser and is upgradeable to 20 mW.

The AR4000-LV offers a visible red laser diode. It’s Class IIIa laser has an effective range of 13m and an accuracy of 7,5mm. It is standard with a 5 mW laser.

The AR4000-RET is a Class I, eye-safe infrared laser sensor. It requires the use of reflective tape and is ideal for measuring linear displacement of a target. The AR4000-RET has a calibrated range of 17m and with an accuracy of 2,5mm inches. It has the ability to measure up to 100m in an uncalibrated mode. It is standard with a 130 mW laser.

The AR4000 laser rangefinders employ a modulated beam "time-of-flight" principle, which measures the time light takes to travel to the target and back. The time delay is indirectly measured by comparing the signal from the laser with the delayed signal returning from the target. Acuity's modulated beam rangefinders work on a patented range-to-frequency conversion principle, which offers several advantages over conventional phase measurement. Our sensors are typically used in intermediate range applications, for distances from a few inches to several tens of feet on uncooperative targets. With cooperative targets such as with reflective tape, range can be extended to several hundreds of feet. Calibrated distance measurements from the AR4000 sensor are corrected for return signal strength, background light levels and temperature.

The AR4000 sensors come with standard serial RS-232 output. Sensor data cables are terminated with a DB-9 connector for direct connection to a PC and other equipment. AR4000 sensors can be ordered with current loop, RS-422, RS-485 or pulse-width (used with the AccuRange High Speed Interface Card) outputs. Low-level outputs include signals for background light levels, temperature and return signal strength.

Serial Output
ASCII	Calibrated output: 3-6 bytes; CR, LF terminated Low-level outputs: 9-24 bytes CR, LF terminated
Binary	Calibrated output: 3 bytes; FF terminated Low-level outputs: 8 bytes; FFF terminated
RS-232 (standard)	300 - 38.4 K baud
RS-422 (optional)	300 - 38.4 K baud, 4000 ft. max line length
Analog signals (optional)	4-20 mA current loop installed internally, configurable zero and set points
Pulse Width Output (standard with HSIF board)	Uncalibrated range output on power/signal cable 18 - 50000 Hz, 0.5V peak to peak square wave signal
Low-level Outputs (standard)	Supplementary outputs on power/signal cable for target signal strength, background illumination and sensor temperature. Voltage outputs are 0-5 volt analog levels.

Laser
LIR & RET	780 nm, Class IIIb and I respectively
LV	670 nm, Class IIIa

Range
LIR	17 m
LV	13 m
RET	17 m calibrated, up to 100m range in uncalibrated mode

Accuracy
LIR & RET	2.5 mm to 85% diffuse reflectance
LV	7.6 mm to 85% diffuse reflectance

Resolution	0.032mm at 700 Hz
Sensor principle	modulated beam, time-of-flight
Laser spot size	2.5 mm 0.5 milliradian divergence
Collection aperture	63.5 mm diameter lens
Laser power	8mW, 5mW, 0.13 mW (LIR, LV, RET respectively)
Sensor power	+5-6 V D.C. (400 mA at 5V)
Weight	625 grams
Operating temperature	-17 to 50°C, negligible accuracy drift
Enclosure	meets NEMA-4 and IP-67 requirements

Sample rates (configurable)
max.	50,000 Hz with optional High Speed Interface,
Serial output	700 Hz with standard serial output
Analog output	1000 Hz with optional analog output
High speed interface	50,000 Hz
min.	0.2 samples / sec or sample on request

Cable length	2m
Cable configuration	8 conductor, Power and serial Data cables

20 mW Laser Upgrade: Upgrade laser power from 8 mW to 20 mW for the AR4000-LIR. For high sample rates on dark or shiny targets at long distance or use on radiating surfaces. Includes IR laser safety interlocks.

RS 422 Output: Differential serial output for communication up to 4000 feet. 300 - 57600 baud.

Current Loop Output: 4-20 mA current loop output for AR4000, installed internally.

Close Focus Optics: Special optics with the greatest sensitivity within 9 feet and maximum range of 16 feet. Customer specifies min. & max. working distances.

Optical Filter: Optical Filter for brightly lit or glowing targets, installed internally.

AccuRange Line Scanner: One-axis spinning mirror and encoder assembly for scanning points in a line. Scanner couples with AR4000-LIR sensor.

High Speed Interface: Increases sample rate to 50 KHz. Designed to be used with AccuRange line scanner to track two encoder signals. Available in ISA, PC-104 and PCI formats.

Software Library: Software Library license for AR4000 using serial interface or High Speed Interface. Includes tested functions for C, C++, VBA and Microsoft® Excel.

Pan-tilt Unit: Programmable pan and tilt device to automate the pointing and movement of the AR4000 or AccuRange line scanner.

Display: Encased display with bright blue characters, 9 mm high for output from AR4000 in mm or in.

Laser rangefinder

AR4000 series

Aggiornato il 05 dicembre 2005