Mitutoyo AT715 - Scale Unit Features; Optional Extension Cable Usage; Operating Principle of AT103;AT113 Models; AT715 Scale Detecting Principle

12
2-phase sine-wave signals
2-phase
square-wave signals
Resolution
Interpolation circuit
20
μ
m
Light-receiving device
(photodiode array)
Glass scale
Collimator lens
Light-emitting diode
(LED)
Glass scaleCollimator lens
Light-receiving device
(photodiode array)
Grating graduations
(graduation pitch: 20
μ
m)
Light-emitting diode
(LED)
Operating Principle of AT103/AT113 Models
The assembly-type Linear Scale
®
uses a highly accurate glass scale
GRATING¬PITCH¬OF¬ ¬«M¬AS¬THE¬BASIC¬STANDARD¬OF¬LENGTH¬4HE¬GRATING¬
is irradiated with parallel light generated with a Light-Emitting Diode
(LED) and collimator lens. The parallel light transmitted through the
grating generates an interference pattern with the same pitch as that
of a grating on the photodiode array of the light-receiving device.
The receiver output signal is 2-phase sinusoidal with a wavelength
OF¬ «M¬IDENTICAL¬TO¬THE¬PITCH¬OF¬THE¬GRATING¬GRADUATIONS¬AND¬
is electrically converted to 2-phase square-wave signals by the
interpolation circuit. The much smaller working resolution is achieved
by detecting the cyclic variation in light intensity incident on the
receiver array, as the scale is displaced in a measuring direction, and
interpolating accordingly to output a corresponding displacement
value.
Scale Unit Features
AT103
When using an optional extension cable
Optional extension cable Signal cable
Cable length: 2m / 5m / 7m
Cable length: 2m / 5m / 7m
Cable length: 2m / 5m / 7m
Cable length: 2m / 5m / 7m
Cable length: 2m / 5m / 7m
AT113
AT116
AT112
AT181
AT715
Cable length:
3m / 5m / 7m / 10m / 15m*
Cable length:
3m / 5m*
Cable length:
3.5m / 5m*
Cable length:0.3m
Cable length:0.3m
Cable length:
3m
Cable length:
3m
Cable length:
3.5m / 5m*
Cable length: 2m / 5m / 7m
*Depending on the size of scale unit
KA counter, standard type
KLD-200 counter, with limit
signal output
Detecting Principle Added to AT715
4HE¬!BSOLUTE¬SYSTEMTYPE¬LINEAR¬SCALE¬!4¬EMPLOYS¬A¬UNIQUE¬
Mitutoyo-proprietary, electromagnetic induction principle that is
highly resistant to environmental contamination.
!CHIEVEMENT¬OF¬A¬COMPLETE¬ABSOLUTE¬SCALE¬WITH¬A¬RESOLUTION¬OF¬«M¬
thanks, to a multi-track configuration, enables the user to obtain
absolute positional information from the scale immediately power is
applied to the counter.
s¬)F¬TIMEVARYING¬CURRENT¬)¬IS¬APPLIED¬TO¬COIL¬!¬A¬MAGNETIC¬mUX¬IS¬
generated inside the coil.
s¬!¬CURRENT¬) ¬IS¬INDUCED¬IN¬COIL¬"¬THAT¬TENDS¬TO¬OPPOSE¬THE¬BUILDUP¬
OF¬THE¬MAGNETIC¬mUX
The magnetic permeability between the coils will not vary whether
the medium is air, water, or oil.
The electromagnetic induction type sensor has excellent water
resistance and oil resistance.
Coil A
Coil B
Basic principle of electromagnetic
induction type sensor
Theabsoluteencoderis
comprisedofmulti-track
components.
Multiplecoilsare
arrangedonthescaleat
aconstantpitch.
Amountofdisplacement
P
P
Scalecoil
Sensorassembly
Displacement
Excitercoil
Detectorcoil
VoltageV
Operating Principle of
Electromagnetic Induction Type Encoder