Programmable Encoder for DNA Sequencing

Genomics is a science that deals with the mapping of DNA of living organisms. The advantages of this technology are applied to a number of fields, including plant and animal biology, microbiology, human biomedical research, and infectious disease research. An automated sequencing system of a customer utilizes a unique technology which, in fact, monitors minute quantities of light generated by the natural process of DNA replication. This technology demanded extremely precise sample positioning under the light detection optics in a very stable temperature environment.


The Solution

For the fine positioning of a six-axis (hexapod) stage, the Mercury II programmable encoder family was paired with a piezo motor stack. The encoder offered the customer with a very high resolution with a low pass noise filtering, low power dissipation in the head, customized sensor cables for ease of installation, and integrated end of travel limit signals. The hexapod motors are turned off during measurement and therefore, position stability is of extreme importance.

Mercury II programmable encoder

The Benefit

The Mercury II optical (non-contact) encoder functions on a 20 µm pitch diffraction scale with integrated index and left/right limit marks. With up to 16,384 x interpolation, it boasts a user programmable resolution ranging from 5 µm to 1.22 nm. External digital interpolation maintains the power dissipation in the sensor head low and a digital low pass input filter offers outstanding position stability by rejecting high-frequency noise sources.

Mercury II optical (non-contact) encoder


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Sensor Dimensions 32.0 x 13.5 x 8.7 mm
Interface Digital A-quad-B with index and limits
Grating Dimensions 15.0 x 6.0 x 2.5 mm (index and limits included)
Grating Period 20 µm
System Resolution 1.22 nm
Maximum Speed 48.8 mm/sec
Sensor Weight 6 g


Celera Motion

This information has been sourced, reviewed and adapted from materials provided by Celera Motion.

For more information on this source, please visit Celera Motion.


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