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Versatility in perfection


Electronic autocollimator for precise optical angle measurement

The TriAngle electronic autocollimators are non-contact optical test tools for the high-precision measurement of angular displacements of specular reflective surfaces and the accurate angular alignment of optical or mechanical parts.

TriAngle autocollimators have a versatile modular design which allows them to be fitted with a wide selection of objective tubes, different sensors, reticles and light sources. With objective tubes of different focal lengths and apertures, the optimum measurement solution regarding angle resolution and measurement range is easily found. The modular design, the large variety of products and the extensive accessories allow the use of the TriAngle autocollimators for various angle measurement applications in optics manufacturing as well as in mechanical engineering.

  • 1 Highest accuracy

    The measurement of angular displacements iscarried out with highest accuracy. TriAngle models meet maximum demands on angle resolution and measurement accuracy. The TriAngle UltraSpec measures with an accuracy performance of up to 0.05 arcseconds.

  • 2 Wide application range

    Based on a modular design and a large number of product versions and accessories a wide range of applications is covered. This includes angle measurements of optical components as well as special applications for the mechanical engineering market.

  • 3 Powerful software

    User-friendly and powerful software solutions are available for various angle measurement tasks.

Automated measurement trigger

Your alignment measurement with the electronic autocollimator TriAngle sometimes needs to be started
exactly when one special condition is fullfilled. This is where the trigger function comes in handy. Order your
TriAngle in its special 30th anniversary edition until end of 2021 and get the trigger for free!

Contact sales

Product Overview

TriAngle Product Finder

To find the right TriAngle for your application please use our TriAngle product finder:

  • TriAngle

    Universal electronic autocollimator

    The TriAngle electronic autocollimator is the standard and most universal instrument of the TriAngle series.

    Variable measuring range and accuracy performance between 2.5 and 0.2 arcsec depending on the focal length

    Different objective tubes available with focal lengths from 100 mm to 1.000 mm

    Ideally suited for standard angle measurement and alignment purposes

    More Information
  • TriAngle UltraSpec

    High precision electronic autocollimator

    TriAngle UltraSpec offers high-precision angle measurement systems for highest demands on angle resolution and accuracy especially in the laboratory.

    Available with 300 mm and 500 mm objective focal length

    Variable measuring range and accuracy performance of up to 0.05 arcsec

    Mechanically and thermally optimized design

    More Information
  • TriAngle Focus

    Focusing electronic autocollimator

    The TriAngle Focus series is particularly suitable for the measurement of slightly spherical mirror surfaces due to the focusing objective tubes

    Ideally suited for the contact-free optical radius measurements

    Different objective tubes available with focal lengths from 100 mm to 1,000 mm

    Variable measuring range and accuracy performance between 2.5 and 0.2 arcsec depending on the focal length

    More Information
  • TriAngle NIR

    Electronic autocollimator for
    near infrared application

    The TriAngle NIR electronic autocollimators are commonly used for applications which require measurement at the design wavelength in the NIR.

    Especially suitable for measurements on material which only reflect light in the NIR range, such as night vision devices

    Compatibility with objective tubes of different focal lengths

    Variable measuring range and accuracy performance between 2.5 and 0.2 arcsec depending on the focal length

    More Information
  • TriAngle Laser

    Electronic autocollimator
    with laser light source

    The TriAngle Laser is Ideal for the measurement of small optical components, surfaces of low reflectivity or long distance measurements.

    Laser light source instead of an LED illuminated reticle

    Different objective tubes with focal lengths from 100 mm to 1,000 mm

    Variable measuring range and accuracy performance between 2.5 and 0.2 arcsec depending on the focal length

    More Information
  • TriAngle Large Field

    Electronic autocollimator with large
    measuring range

    The TriAngle LF autocollimator has been designed for applications requiring a large measuring range without compromising the measurement accuracy and resolution.

    Accuracy ± 3“ within 80 % of the measuring range

    Available with a focal range of 100 mm

    Use of specially calibrated large field sensor and optimized imaging optics

  • TriAngle Short

    Compact electronic autocollimator

    The TriAngle Short is an electronic autocollimator that combines the high accuracy of the TA 500-57 with the compact and thermally stable design of the TA 300-57.

    Effective focal length of 500 mm with simultaneous tube length of only 300 mm

    High accuracy of 0.4 arc seconds

    Possible uses in environments with limited room

  • D-275

    Automatic Alignment Telescope

    The D-275 Automatic Autocollimating Alignment Telescope focuses from 40 cm to infinity, to align and measure the location and angular orientation of any number of targets along its optical axis.

    Only fully automated telescope for alignment and/or measurement of 5 axes of components in optical beam paths and subassemblies

    Since the mechanical axis of the tube and the optical axis of the instrument are parallel within 1 arc second, the instrument is easily adaptable to mounts, jigs, stages, and setups using a dial indicator.

    A reflective surface may be established normal to the optical axis by utilizing the autocollimating feature. The D-275 Automatic Alignment Telescope provides the flexibility to align most complex optical assemblies and beam paths.

    More Information


Versatile range of applications

The applications for TriAngle electronic autocollimators are manifold. The wide portfolio means that the right model is available for every application.

Measurement applications with electronic autocollimators of the TriAngle series
  • Tilt Angle Measurement
  • Alignment of Optical Components
  • Wedge Angle Measurement in Reflection
  • Wedge Angle Measurement in Double Pass
  • Wobble Measurement
  • Vibration Measurement
  • Prism & Polygon Measurement (45°/90°)
  • Measurement of Slightly Curved Surfaces
  • Measurement of Flatness / Straightness / Parallelism
  • Rotary Table Calibration
  • Angle calibration tasks
  • Corner Cube Inspections


The complete software package for angle measurement

  • Description
  • Functions
  • Integration

The software OptiAngle® is a powerful tool covering all aspects of accurate angle measurement with the TriAngle electronic autocollimators in terms of measurement, control and analysis of the angular data. The well organized and modern menuguided user interface assists even the inexperienced operator to perform accurate measurements and to obtain repeatable results. A large set of pre-defined standard measurement applications is integrated into OptiAngle® which cover all established measurement techniques in optical and mechanical industry. In addition, customized measurement routines can be easily developed and embedded either by TRIOPTICS or the experienced end user. All OptiAngle® measurement functions can be further used in other common applications like Lab-View or Visual Basic (Excel).

The TriAngle software provides many features to simplify the daily use of TriAngle autocollimators whether in the laboratory or in the production environment.

  • Real-time camera display
  • Numerical and graphical display of measurement data
  • Optional full screen camera window (visual alignment mode)
  • Indicators inside the camera window
  • Simultaneous measurement with multiple (up to 12) autocollimators
  • Simultaneous measurement of multiple surface reflections (up to 12)
  • Comprehensive data reporting functions
  • Data export format: ASCII (CSV), XLS, PDF
  • Selectable angle units for screen display and measurement certificate
  • Software remote control by host computer via RS232, TCP/IP interface
  • Programming interface by automation or via DLL
  • Scripting mechanism for customized measurement programs
  • Scripting interface for user-based solutions
  • Demo programming examples for LabView, and VBA (Excel)
  • Multiple camera interface technology for IEEE 1394 (FireWire) or USB. On request: Gbit Ethernet, CameraLink or Analog Video Cameras
  • Production mode for batch/lot sample identification and result reporting
  • Load option of saved results
  • Easy integration of customized measurement solutions

    The OptiAngle® software allows the integration of customized measurement programs with a dedicated user interface for specialized target applications. Custom specific measurement routines and display functions are quickly implemented to take care of specialized procedures, e.g. in a production environment.

  • The advantages are:
    • User interface adapted to specialized applications
    • Increase of throughput
    • Avoidance of faulty operations in production processes
    • Integration of external hardware and software possible
    • Adaptation to familiar data processing and display
  • OptiAngle® Programming Interface (API)

    In addition to the above scripting mechanism, the OptiAngle® functions can be embedded into a larger measurement framework which then can take control over the full functionality of OptiAngle® measurement applications.

    OptiAngle® features an open software concept and programming interface which allows for the flexible and easy integration into other software environments. The angle measurement functions of TriAngle autocollimators can thus be integrated into almost any existing measurement application. In contrast to the scripting technology the user himself is enabled to develop the interfacing between the TriAngle autocollimator and his governing application. OptiAngle® functions are executed either by sending commands via serial port (RS232) or TCP/IP, or directly using the C based DLL programming interface (API). Existing sample applications and the comprehensive documentation demonstrate the control of TriAngle autocollimators by LabView, VBA, Excel. TRIOPTICS will be happy to assist the user to integrate the TriAngle functions into his own application.

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Technical Data

 Effective focal lengthClear apertureAccuracyField of viewMeasurement Frequency
Productmmmmarc secarc secHz
TriAngle TAUSB 3.0USB 3.0
TA 100-38100262.56,170 x 4,940Up to ≥ 100Hz depending on
settings (shutter time) and
measurement conditions
TA 150-38150301.74,120 x 3,300
TA 200-38200301.33,090 x 2,470
TA 300-38300300.752,060 x 1,650
TA 300-57300480.752,060 x 1,650
TA 500-57500480.41,240 x 980
TA 1000-1151,0001000.2610 x 490
TA 1000-1401,0001250.2610 x 490
TriAngle FocusUSB 3.0USB 3.0
TA F 100-38 ±10100182.56,170 x 4,940Up to ≥ 100Hz depending on
settings (shutter time) and
measurement conditions
TA F 150-38 ±10150261.74,120 x 3,300
TA F 200-38 ±10200261.33,090 x 2,470
TA F 300-57 ±25300480.752,060 x 1,650
TA F 500-57 ±25500480.41,240 x 980
TA F 1000-115 ±501,0001000.2610 x 490
TA F 1000-140 ±501,0001250.2610 x 490
TriAngle UltraSpec USB 3.0USB 3.0
TA US 300-5730045±0.05 over range of 10 arcsec
±0.10 over range of 20 arcsec
±0.25 over total FOV
3,000 x 1,920Up to ≥ 100Hz depending on
settings (shutter time) and measurement conditions
TA US 500-57500451,800 x 1,150
TriAngle Large FieldUSB 3.0USB 3.0
TA LF 100-381002633° x 3°4 Hz
TriAngle TA, UltraSpec – Illumination: high power LED at 525 nm or 625 nm;
TriAngle Focus, LargeField – Illumination: high power LED at 525 nm
TriAngle Laser USB 3.0USB 3.0
TA L 100-38100262.56,170 x 4,940Up to ≥ 100Hz depending on
settings (shutter time) and
measurement conditions
TA L 150-38150301.74,120 x 3,300
TA L 200-38200301.23,090 x 2,470
TA L 300-38300300.82,060 x 1,650
TA L 300-57300480.82,060 x 1,650
TA L 500-57500480.51,240 x 980
TA L 1000-1151,0001000.25610 x 490
TA L 1000-1401,0001250.25610 x 490
Illumination: Laser diode at 635 nm
TriAngle NIR USB 3.0USB 3.0
TA NIR 100-38100262.56,170 x 4,940Up to ≥ 100Hz depending on
settings (shutter time) and
measurement conditions
TA NIR 150-38150301.74,120 x 3,300
TA NIR 200-38200301.33,090 x 2,470
TA NIR 300-38300300.752,060 x 1,650
TA NIR 300-57300480.752,060 x 1,650
TA NIR 500-57500480.41,240 x 980
TA NIR 1000-1151,0001000.2610 x 490
TA NIR 1000-1401,0001250.2610 x 490
Illumination: high power LED at 780-1,064 nm

Upgrades & Accessories

RIOPTICS offers for the TriAngle electronic autocollimator series a large range of opto-mechanical accessories, often required for certain standard applications.

  • Holder
  • Mirror
  • Calibration tools
  • Alignment tools
Clamp fixture Clamp fixture
Adjustable holder Adjustable holder
Stand Stand
Clamp fixture Adjustable mirror
Adjustable holder Mirror in mount
Stand Redirecting mirror
Stand Pentaprism in holder
Clamp fixture 12 sided polygon
Clamp fixture Laser alignment tool

Knowledge Base

Electronic autocollimator

In an electronic autocollimator the eyepiece is replaced by an electronic camera with discrete sensor pixels (e.g. CCD or CMOS sensor type). It can be of a 2D frame type allowing angular measurements in two directions, or a 1D line scan sensor for single axis measurements. The digital camera is usually connected to a PC which calculates the measured angle from the image by using image analysis software. The PC assisted measurement guarantees much higher resolution, accuracy and repeatability of the results compared to the visual inspection, since it does not depend on the operators experience and attention.

The high resolution of electronic autocollimators is due to the evaluation of gray scale levels in the image which allows for sub pixel interpolation of the image position. Depending on the focal length of the objective lens and the stability of the setup, angular resolutions of 1/100 up to 1/1000 arcsecs can be achieved.

More knowledge for experts

Everything you need to know about image quality testing of
camera modules can be found in the knowledge base of
Go to Knowledge Base from OptiTest® .

To OptiTest®
Electronic autocollimator
Sub pixel resolution by evaluating image gray levels

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