DT Series Interferometric Laser Encoder

The DT Series is a chip-integrated interferometric laser encoder for long-travel precision positioning. It combines a photonic integrated chip with non-linear FMCW modulation to deliver wavelength-based accuracy of up to ±1 ppm and resolution down to 0.1 nm, over a measurement range of 0.1 to 100 m. There is no physical scale to splice and no precision optical alignment to perform. Standard encoder interfaces (BiSS-C, SSI, TTL, 1 Vpp) let it drop into existing motion control systems.

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±1 ppm standard accuracy with active environmental compensation
Measurement range from 0.1 m to 100 m in a single continuous measurement, with no butt joints or cumulative splice error
Resolution down to 0.1 nm (depending on interface)
Photonic chip integration of laser, modulators, combiners and detectors, which eliminates the relative thermal drift of discrete optical systems
Non-linear FMCW modulation for higher resolution and stronger anti-interference performance, with no dead-zone issue
Alignment-free focused reflector that tolerates ±0.2 to ±0.3 mm lateral offset
Ultra-light moving reflector module and stationary optical module for zero backlash and low dynamic error in full closed-loop control
Built-in sensors for real-time compensation of wavelength and material temperature
Max velocity up to 240 m/min (depending on resolution setting)
Multi-color LED diagnostics (green, yellow, red, blue) for signal quality and alignment status during setup
Available in three forms: Standard Sealed (SE), Compact Sealed (SC) and Open Frame (OP)
Laser Class 1 (IEC 60825-1), CE and RoHS compliant

  
        Conventional linear scale
        Conventional interferometer
        Dynatronic DT Series
      
        Precision model
        Graduation-limited (µm)
        Wavelength-based (nm-pm)
        Wavelength-based, chip-integrated
      
        Range
        Physical length; splicing beyond 10 m
        Fiber-limited, typically several meters
        0.1–100 m, scale-free
      
        Integration
        Drop-in, mature ecosystem
        System-level, alignment-intensive
        Sensor-level, alignment-free
      
        Cost curve
        Linear with length
        High fixed system cost
        Semiconductor scaling

Designed for

Semiconductor motion stages
Long-travel axes on precision machine tools (NC milling, turning)
Linear motor modules
High-precision 3D coordinate measuring machines (CMM)

  
        System-level performance
      
        Name
        Detail
      
        Measurement Wavelength
        1310 nm
      
        Standard Accuracy
        ±1 ppm / ±3 ppm / ±5 ppm (with active environmental compensation)
      
        Resolution
        0.1 nm / 1 nm / 5 nm / 20 nm, depending on interface
      
        Measurement Range
        0–100,000 mm, no physical scale required
      
        Maximum Velocity
        ≤ 240 m/min, depending on resolution setting
      
        Interfaces
        TTL, 1 Vpp, BiSS-C, SSI, BiSS+1Vpp, SSI+1Vpp
      
        Interface Clock
        ≤ 80 MHz (TTL) / ≤ 10 MHz (BiSS/SSI)
      
        Reference Point
        Center of effective travel (default)

Environmental and integration
Name	Detail
Environmental Compensation	Built-in sensors for real-time compensation of wavelength and material temperature
Installation Alignment	Focused reflector, ±0.2 mm to ±0.3 mm lateral offset allowed
Form Factor	SE (Standard Sealed), SC (Compact Sealed), OP (Open Frame)
Power Supply	12–24 VDC, ≤ 5 W
Operating Temperature	0 to 50 °C (storage -20 to 70 °C)
Protection Class	IP53 standard; IP64 with DA 400 air purge (SE/SC)
Vibration / Shock	≤ 100 m/s² (55 Hz–2000 Hz) / 11 ms half-sine
Laser Class	Class 1 (IEC 60825-1)
Compliance	CE, RoHS
Warm-up Time	< 15 min

All values valid under stated test conditions.

  
        Interface compatibility
      
        Interface
        Controller ecosystem
      
        BiSS-C
        Siemens, Heidenhain, Fanuc
      
        SSI
        Bosch Rexroth, Beckhoff
      
        TTL
        Standard motion controllers
      
        1 Vpp
        Analog drive systems
      
        BiSS + 1 Vpp / SSI + 1 Vpp
        Dual output

Model code

DT-[Series]-[Accuracy]-[Interface]-[Resolution]-[Scale Length]-[Cable Length]

Standard example: DT-SE-1P-BiSS-5UM-1M-3M

Custom example: DT-SC-2P-TTL-0.1UM-2.5M-5M

Configuration options
Field	Options
Series	SE / SC / OP
Accuracy	1P / 3P / 5P (±1 / ±3 / ±5 ppm)
Interface	BiSS / SSI / TTL / 1VPP (combinations allowed)
Resolution	0.1NM to 5UM
Scale Length	1M / 2M / 2.5M ... / NA (SE/SC only; use NA for OP)
Cable Length	3M / 5M / 10M ...

Standard configuration includes a 1 m scale length (SE/SC) and a 3 m cable. Longer scale or cable lengths are available at additional cost. Contact us for a configuration-specific quotation.

Laser Encoder DT-SE

(All dimensions in mm if not marked otherwise)

Laser Encoder DT-SC

(All dimensions in mm if not marked otherwise)

Laser Encoder DT-OP

(All dimensions in mm if not marked otherwise)

DA 400 air purge: upgrades SE/SC from IP53 to IP64
Interface cable: 3 m standard, 5 m, 10 m or custom