Tree-D Model T261 High Speed Scanner

The Tree-D Model T261 laser scanner uses optical triangulation in a unique optical configuration using a bright laser spot and a high signal-to-ambient light level ratio. This allows operation in full sunlight. Unlike some triangulation type scanners, the T261 uses a narrow included angle between the laser and the measuring camera. This included angle has been optimized as a trade off between ease of application and the accuracy required for adequate scanning of logs at high speed. Accuracies of ±0.005” are achieved depending on working distance.

Conventional “light shear” scanning systems use laser line generator optics to spread the laser energy out over a line. The Model T261 scans a single, bright laser spot across the surface. Using a single moving mirror, a line scan imager tracks the laser spot. This produces laser intensity at any given surface point tens to hundreds of times brighter than if it were spread out over a long line.

The T261 scanner contains its own temperature control system, maintaining the laser and sensor circuitry temperature to narrowly defined range. This ability to regulate internal temperature maintains high scanner accuracy over the entire working temperature range.

The scanning mirror is driven at about 36Hz, which produces 72 scans per second (one up scan and one down scan). This results in one scan per inch of motion when scanning an object moving through the scanning system at 360 feet per minute. Each T261 scanner contains an advanced RISC architecture microcontroller that communicates to a data concentrator computer through a high-speed serial connection. This microcontroller acquires distance measurement samples thousands of times per second. This data is then translated into X and Y coordinates representing the surface of the object being scanned. These coordinates are buffered on the concentrator computer and made available as a server process over ethernet.

Scanner Performance
Measurement speed 7200 samples/sec
Scanning speed 72 scans/sec maximum
The scanner needs protection from rain and direct sunlight. Rain impairs the ability of the system to measure correctly. Direct sunlight can overload the temperature control ability of the unit and cause overheating. Sunlight does not otherwise adversely affect the T261 scanner.
Operating temperature range (°F) 26– 122
Size (W,L,H in inches) 9.75 x 6.75 x 6.375
Weight (lbs) 19
Mounting 3 ¼-20 screws
Laser wavelength (nm) 690
Laser power (mw) 20
Measurement system Dual-axis triangulating
The T261 scanners have two glass windows treated with a scratch resistant coating. Scanner operation is directly affected by the windows’ condition. Ordinary window cleaning products can be used to clean the windows as needed.
Power requirements ±18VDC at1A
Communications interface RS-422
Communications data rate (baud) 460,800
Maximum scanner-to-concentrator cable length (ft) 400
The T261 scanner can be used in data acquisition applications anywhere high accuracy is required under harsh environments including high ambient light, high vibration, and mild contamination. These environments include lumber mills, pole manufacturing plants, etc.

T261 scanners can be arranged in pairs, triplets or quad-scanner arrangements to provide a scan plane permitting a full 360 degrees of coverage with overlap.

All Tree-D products carry a 1-year warranty.