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Surface Variation Detector
(With Noise Cancel Function)


  • Size of the detected variation (lump, neckdown or the like) can be seen at first sight on the display screen with 7 segments LED.
  • Setting of 2 different detecting sensitivity level is available.
  • Data of the detected variation is saved inside the display unit and, the size and position of the variation can be captured via RS-232C interface.
  • Mal-function caused by dust, bugs, outside random light, etc, can be vastly diminished due to the noise cancelling function.
  • Maximum 8 axes can be connected with single display unit.

Surface Variation Detector ( Standard type ) ==> Go

The guide of Calibration gauge /Gauge pin Unit /Fixture is here. ==> Go


Surface Variation Detector ( TMS Series )-- Specifications


DETECTOR Display unit
Model TMS-1104W Model TMS-01
CAD file dxf   pdf dxf format
CAD file
dxf   pdf
Detecting derection 4 axis Sampling Friquency 75KHz(4axis)
Detection Method Double-slit, infrared LED projection type Main Display 7segmentLED 5digit
Detectable Outside Diameter φ0.02~5mm Sub Display 7segmentLED 2digit
Detecting Sensitivity 0.02~0.999mm Recorder Output 0.1mm/V
Detecting Accuracy +/-10μm. set value Length Measurement input encorder input
Slit length 18mm Length Measurement power output DC12V Max50mA
Slit width 0.5mm Alarm Output Relay contact output(AC250V 2A Resistance load)
Feeding speed[*1] 1m/min~1000m/min Outside Contact input Reset input
Response 3Hz~10KHz RS-232C interface OK
Cable length
( Between Sensor/Display )
Alarm Time 0.01~0.999Sec
Ambient Temperature -5 - 50 degree centigrade
(No condensation)
Power Source AC90~240V 50/60Hz
Power Consumption 17VA
Outside Dimension
350×280×55 Outside Dimension
Weight 3.5kg Weight 3kg
[*1]Applicable Line speed range varies by variation height.

  * A method of noise cancel

The variation (lump, neckdown or the like)surely passes the 2 slits(Slit 1 and Slit 2). And, the change of light volume received in Slit 1 and Slit 2 shows nearly the same waveform.

Dust, contamination or the such passes either of the 2 slits or passes the slits at a speed different from the line speed.

Random light coming from outside causes light volume received in the 2 slits to change at the same time.

In reference to these characateristics mentioned above, TMS-01/TMS-1104W detector will;

  1. calicurate the passing time lag between Slits 1 and Slit 2, based on the line speed gained from speed input.
  2. not detect it as a variation, the signal that is considerably out of the time lag.
  3. not identify it as a variation, the thing of which waveform is considerably different from that of the variation in Slit 1 and Slit 2.
  • Length measurement pluse will be used for TMS-01/TMS-1104W detector so that various operation will be placticed in accordance with the line speed.
  • Tolerance of time lag can be set in order to allow the effect by change of the line speed or measurement error of the speed input.


 Variation Level Setting

The value in 3 figures on the level adjuster shows the alarm level, in the unit of micron or millimeter.
This set value shall be the absolute value of the difference of diameter of the part having variation and diameter of the normal part (that is, Dia. at part with variation - Dia. at normal part).
For example, when set as [0.52], in case the normal diameter is 1.000mm, the alarm will be output at the status that the diameter of the part having a projection becomes 1.520mm or more(upper and middle Fig..) or at the status that the diameter of the part having a dent becomes 0.480mm or less (bottom Fig..).

  • Re-adjustment of the set variation alarm level is not necessary, in case the variation levels of projected and dented parts to be detected are same even if the diameters are different.
  • For the detection at the status which is required to set alarm level at high sensitivity area, it shall be required to eliminate and/or minimize the vibrations of object itself and systems, outside lighting, water drops, dirt, etc.

 Line speed and Min. Responsive variation width

As adopting AC amplifier circuit, the low cut-off friquency is approx. 3Hz and the high cut-off frequency is approx. 10KHz.
therefore, in case the diameter of the object changes very gently and/or the variation width is very small, the detecting sensitivity might be deteriorated.
For detection of such gently changing variations, minimum responsive variation width and line speed are related mutually and the guildance mentioned below is for the refernce :

  Line speed       Detectable variation width
  30m/Min.   →    15cm or more
  60m/Min.   →    30cm or more
  120m/Min.  →     60cm or more

Also, minimun responsive variation width is related to be response of the system and line speed and its calculation fomula is as follow :

 Min. Responsive Variation Width(mm)=
     Cable length moving for one sec.(mm/Sec) 
                        / Response of system(Hz)
        But, min. variation width shall be within the slit size.

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