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High Speed, Multi-Point Laser Displacement Sensor HL-D3

High-precision laser with a resolution of 1 μm 0.039 mil
The functionality of 500 displacement sensors in just a 12.5 mm 0.492 in wide device!

CE Marking Korean KC FDA

CE , Korean KC , FDA Approved
CE : EMC Directive
FDA : HL-D301B, HL-D301C only


High speed multi-point sensing and stable appearance measurement in one device

The HL-D3 series was developed based on a new concept of capturing the shape of objects with “pointsˮ instead of a “line.ˮ The new displacement sensors feature the following enhancements while not compromising the Z-axis resolution:
■1 Faster measurement, achieved by selecting only the desired sensing points
■2 Adjustable light intensity for each sensing point, which contributes to stable, precision detection
This is equivalent to the performance of 500 high-precision displacement sensors with a resolution of 1 μm 0.039 mil.

Measurement center distance and range(Z axis)

50 ±10 mm 1.969 ±0.394 in

Measurement range of width(X axis)

12.5 mm 0.492 in

Measurement center distance and range(Z axis)

Max. speed 80 μs

(2-point specified)

Resolution(Z axis)

1 μm 0.039 mil

(average number of samples: 64)

HL-D3 uses parallel beams made possible by the latest optical system. The reduced area of shadow that appears when the emitted light strikes the target object make it possible to accurately ditermine the shape of the object.

Four modes for different measurement requirements

The HL-D3 series is equipped with four sensing modes to enable to a variety of measurement needs, including in-line high-speed sensing and off-line high-precision detection.

Multi-select displacement sensing mode [MSDS]

The displacement sensor senses up to 10 measurement points specified on the X axis (measurement range of width) and completes the judgment at extremely high speed.
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Whole synchronized measurement mode

The displacement sensor performs sensing of all target objects with the same sensitivity adjustment throughout the entire measurement range of width (X axis).
This mode is suitable for the sensing of fast-moving objects.

Multi-zone beam control measurement mode [MZBC]

High-precision sensing is achieved by segmenting the measurement range of width (X axis) to optimize light intensity. This mode is suitable for the sensing of objects with varied glossiness or color.
>>Click here

Constant pitch measurement mode

Sensing is performed at even intervals by adjusting the sensitivity per the pitch specified along the measurement range of width (X axis).
High-speed sensing is made possible by the reduced number of sensing points.

Multiple Shape Calculation Functions and Two Judgment Outputs

The HL-D3 series calculates the shapes, including the height difference, width, and cross-sectional area, from the shape waveform based on the received light. At the same time, the displacement sensor uses these calculation results to instantaneously make Hi / Go / Lo judgments based on the present upper and lower limits.
(Only height calculation and step calculation in multi-select displacement sensing mode)
Thanks to the two sets of output, different shape calculations can be performed for each output or two sensor heads can be connected and used to output each judgment results.

Shape calculation is performed using the representative values extracted from the set calculation area based on the specified conditions. This technique has the benefit of tolerating any shifts in the position of objects being sensed as long as they are within the calculation area.
(Set to extract max. value in the example above)

Height calculation
The height difference between the reference value and measured value is calculated.

Height calculation

Width calculation
The width is calculated from 2 measured values.

Width calculation

Step calculation
The height difference is calculated from 2 measured values.

Step calculation

Cross-sectional area calculation
HL-D3 calculates the cross-sectional area defined by the reference value.

Cross-sectional area calculation
Settings & Monitoring Software (HL-D3SMI) Provided as Standard

Conditions and the monitoring of measurements and judgment results can easily be set up by connecting to the HL-D3C controller and a PC pre-installed with HL-D3SMI using USB cables. The shape waveform based on the saved data can be reproduced on screen, which allows for it to be used as an analytical tool.

Operating environment

OS Microsoft Windows® 7 Professional 32 bit / 64 bit
Microsoft Windows® 8.1 Pro 32 bit / 64 bit
Microsoft Windows® 10 Pro 32 bit / 64 bit
(Japanese, English, Chinese)
CPU 1 GHz or more
Memory 2 GB or higher
Screen display SXGA (1280 × 1024 full colors) or more
Hard disc 50 MB or more of available memory
USB interface USB 2.0 Full Speed (USB 1.1 compatible) compliant
* A CD-ROM drive is required for installation.
* Windows 7, 8.1 and 10 are trademarks or registered trademarks of Microsoft Corporation in the United States and other countries.
* Pentium is a registered trademark of Intel Corporation.

Main (Settings) screen

Main (Settings) screen

The Main screen is where you set up the controller operations and the conditions for the sensor head and individual functions.

Received light intensity image screen

Received light intensity image screen

On this screen, you can review the light receiving status of the 2D image sensor built into the sensor head, as well as the shape waveform of the measured values.

Multi-select displacement sensing

What is multi-select displacement sensing? [MSDS]

Conventional 2D displacement sensors produced the measurements of the specified points after sensing the entire measurement range of width (X axis), which made them unsuitable for high-speed sensing.
The HL-D3 series performs efficient internal processing by sensing only the displacements at the specified points. This feature enables super-fast measurement, from sensing to calculation and judgment. Sensitivity is also adjusted at each point to ensure optimized sensing in order to also achieve high precision.
(MSDS: Multi-Select Displacement Sensing)


  • High-speed sampling
    → Max. speed 80 μs (for 2-point specified)
  • Sensing points can be specified as desired
    → Up to 10 points
  • Measurements of specified points can be buffered
  • Height, step calculation, and judgment results can be output
  • Wide-cell function

[Wide-cell function]
When the surface condition is rough, such as with cut metal, sensing of a single point will result in errors due to the uneven surface.
The wide-cell function expands the sensing points for the light receiving side and obtains the mean value (or maximum or minimum value, depending on the setting) to improve the stability of the measurements.

HL-D3SMI (monitoring software) can. [PART 1]

  • Easily identify the sensed point based on the display of the displacement shape waveform obtained from the light intensity waveform
  • Display the calculation area along with the displacement shape waveform in order to enable an instant understanding of the calculated point and area
  • Display the calculated values of height difference, width, and cross-sectional area on the screen
  • List the displacement value of each sensing point when operating in MSDS mode

Screen displaying measured values
Screen displaying measured values
Screen displaying multi-point displacement values
Screen displaying multi-point displacement values

Multi-zone beam control function

What is multi-zone beam control? [MZBC]

Conventional 2D displacement sensors uniformly use the same light intensity adjustment for the entirety of the measurement range of width (X axis). When parts with significantly differing reflectance exist, the received light intensity becomes saturated or insufficient, preventing the acquisition of effective measurement results.
The HL-D3 series breaks down the measurement range of width (X axis) into small segments and adjusts the emission for each segmented unit (called "light intensity adjustment unit") for optimal sensitivity in order to achieve stable, high-precision sensing.
(MZBC: Multi-Zone Beam Control)


  • Stable sensing is possible even with objects of which reflectance is not consistent throughout the whole object
    → Both metal and resin parts exist
    → Profile consists of flat and sloped parts
  • High-precision sensing
    → Resolution of 1 μm 0.039 mil (average number of samples: 64 with average height measurement)
  • Calculation and judgment results of width, step, and cross-sectional area can be output

HL-D3SMI (monitoring software) can. [PART2]

  • Store displacement shape waveform data, calculated measured values, and judgment results on the memory built into the controller during continuous sensing.
  • Provides a stereoscopic representation of the shape by a 3D display of stored data.
  • Replay the stored data on the buffering screen at a later time, provided that the stored data is saved in the dedicated file format.
  • Allow waveform display and analysis by means of spreadsheet software based on the data saved in CSV file format.

Buffering display screen
Buffering display screen

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