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ATOM™ incremental encoder system with RTLF linear scale

Features

  • Readhead size: 8.35 x 12.7 x 20.5 mm (7.3 x 12.7 x 20.5 mm for FPC version)
  • Resolutions down to 1 nm
  • Speed up to 20 m/s
  • Analogue or digital outputs
  • Low Sub-Divisional Error (SDE) of <±120 nm for 40 µm version and <±75 nm for 20 µm version

Benefits

  • Miniature package
  • Filtering optics design enabling high dirt immunity
  • Diagnostic kit to assist challenging installations and aid system optimisation
  • Self-adhesive tape scale convenience and unrivalled ruggedness 
  • Assured quality 

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What is ATOM?

ATOM is Renishaw's miniature non-contact optical incremental linear and rotary encoder system. Its innovative design combines miniaturisation with leading-edge signal stability, dirt immunity and reliability. This combination is unique in the market place and represents a significant advance in the performance and reliability of miniature encoders.

ATOM is supplied in hi-flex cable and Flexible-Printed Circuit (FPC) variants with either 20 µm or 40 µm scale options.

A range of interfaces is available including the standard Ri, a high-performance Ti and the compact open ACi interface.

What is RTLF scale?

RTLF is a low profile stainless steel tape scale featuring a customer selectable reference mark. There are two levels of available accuracy - standard 40 µm pitch scale with an accuracy of ±15 µm/m and high-spec 20 µm pitch and 40 µm pitch scales with an accuracy of ±5 µm/m. All scales can be supplied in lengths up to 10 m.

RTLF-S is laid onto the substrate with self-adhesive backing tape. The self-adhesive is formulated in such a way that it allows for independent scale expansion to that of the substrate.

To complete the installation, the scale is clamped at one point to provide a datum position.

Why choose this encoder system?

Miniature encoder where space is at a premium

ATOM, available in sizes as small as 7.3 mm x 20.5 mm x 12.7 mm, allows for integration in the tightest of spaces. There are a number of options to choose from including both cabled and component FPC versions.

High reliability and system performance

ATOM is the world's first miniature encoder system incorporating Renishaw's unique filtering optics design. This is further enhanced by dynamic signal processing within the readhead including Auto Gain Control and Auto Offset Control. This combination allows ATOM to have higher dirt immunity and signal purity which is comparable to, if not better, than our standard size readheads with SDE's as low as ±75 nm on 20 µm readheads and ±120 nm on 40 µm readheads. The result is smoother velocity control for improved scanning performance and increased positional stability, essential parameters for many motion control applications.

Assured quality

Quality is assured with ATOM's automated production line and fast delivery. ATOM has a number of quality controls including temperature and humidity testing, vibration testing, ISO9001, static discharge testing, radiated interference testing, conducted interference testing, LED burn-in and 100% inspection.

Interface options

ATOM comes with a variety of interface options which allows greater flexibility to integrate the encoder within your system design.

Ri interface

  • Ri interfaces offer analogue 1 Vpp or digital interpolation outputs down to 50 nm (clocked) and 0.5 μm (non-clocked) in a compact low cost package.
  • This is contained within an industry standard 15 way D-type connector shell, including CAL button.
Ri interface (square)

Ti interface

  • Ti interfaces are designed for applications that require higher speed, lower SDE and digital interpolation down to 1nm and include a CAL button.
  • Clocked outputs have been optimised for speed and performance at all resolutions for industry-standard controllers.
  • Analogue variants are also available.Ti interface (square)

ACi interface

  • ACi interfaces are a range of high performance, miniature, open interpolator subsystems.
  • They bring unparalleled price-performance benefits to today's motion systems that need fine resolution coupled to high speed performance in an ultra compact, open format, small footprint solution and have provision for calibrating the system.
  • Digital interpolation down to 10 nm at up to 40 MHz clocked output is available.
  • FPC or cable input versions available.
Website: ACi for ATOM readhead

Optional diagnostic kit

ATOM™ diagnostic kit (software and hardware)

ATOM diagnostic software can be used to optimise the installation of ATOM encoders and provide a quick and comprehensive system calibration. The software must be used in conjunction with the ATOM diagnostic hardware which can be purchased from Renishaw using part number A-9411-0011. The hardware is connected to the PC via the USB cable (provided in the kit) or in-line with the customers' electronics. 

Find out all about the ATOM diagnostic kit.

Technical specifications

Measuring standard

RTLF: self-adhesive stainless steel tape

Readhead size (LxWxH)

Cable variant: 20.5 mm x 12.7 mm x 8.35 mm

FPC variant: 20.5 mm x 12.7 mm x 7.3 mm

Scale pitch

20 μm and 40 µm

Thermal expansion coefficient

~10.6 µm/m/°C

Accuracy grade at 20 °C

40 μm (high accuracy): ±5 μm/m

40 μm: ±15 μm/m

20 μm: ±5 μm/m

Reference mark

Optical de-selectable

Limit switches

N/A

Scale length

Up to 10 000 mm

Maximum speed
            Analogue


               Digital

(see data sheet for details)

40 µm: up to 20 m/s

20 µm: up to 10 m/s

Dependent on interface type, see data sheet for details

40 µm: up to 20 m/s

20 µm: up to 10 m/s

Sub-Divisional Error (SDE)

40 µm version: Typically <±120 nm

20 µm version: Typically <±75 nm

Dynamic signal control

Real time signal conditioning including Auto Gain Control (AGC) and Auto Offset Control (AOC) for optimised performance across a range of operating conditions

Incremental signals
            Analogue
                 Digital


1 Vpp
Resolutions from 10 µm to 1 nm

Electrical connection

Cable readhead: Interboard connector compatible with the Ri, Ti and ACi interfaces or 15 way, D-type connector
FPC readhead: 16 core, 0.5 mm pitch, compatible with ACi

Power supply

5 V ± 10% <50 mA (readhead),<200 mA (with Ti interface), <100 mA (with Ri interface), <100 mA (with ACi interface) (unterminated)

Vibration (operating)

100 m/s² max @ 55 Hz to 2000 Hz

Shock (non-operating)

1 000 m/s², 6 ms, ½ sine

Operating temperature

0 °C to +70 °C

Sealing

Cable variant: IP40 Ri interface IP20
FPC variant: IP20 (with lid fitted)

Ri/Ti interface: IP20

ACi interface: IP00

Refer to data sheets for full details.

Downloads

Data sheet

Software

  • ATOM™ diagnostic software version 1.0

Technical drawings

How it works

ATOM uses a non-collimated LED located centrally between the incremental and reference mark sensors. This high divergence LED produces a low profile height with a footprint at the scale that is much larger than the LED, enabling illumination of incremental and reference mark regions.

ATOM employs the same filtering optics scheme as used in all Renishaw's incremental encoders. The incoherent LED produces a signal of high harmonic purity allowing high resolution interpolation. Efficient photometry also produces a low jitter signal. A further benefit of the filtering optics scheme is that ATOM does not generate measurement errors due to scale contamination and undulations.

ATOM uses a large single feature off-track optical reference mark for good contamination immunity. Phasing of the reference mark is as simple an operation as with TONiC.

ATOM™ optical scheme with annotations