Three Issues That Occur When the Displacement of High-Speed Moving Objects Cannot Be Tracked Correctly
Continuously moving targets can cause transient behavior itself to be missed due to limitations such as slow sampling or contact.
Slow Sampling Misses Transient Behavior
For targets that move and position at high speed, the position changes significantly in a short period of time. With measuring instruments that have slow sampling, transient waveforms such as rise, settling, and overshoot during that time can only be picked up as points, resulting in calculated peak values that are smaller than they actually are. Missed behaviors are not recorded in the evaluation data, making it impossible to identify the causes of insufficient equipment tracking or misalignment later. To track movement, sampling that is sufficiently fast relative to the frequency components of the target’s movement is essential.
Inability to Understand Transfer and Positioning Tracking Performance Within the Process
The tracking performance of transfer lines and equipment stages cannot be understood from static dimensions alone. If height fluctuations and settling times during movement cannot be captured continuously, worsening behavior during cycle time reduction and fluttering during transfer will be missed. As a result, deviations in positioning accuracy and defects in subsequent processes are difficult to capture on-site while the equipment is running, making cause investigation dependent on individual skills. A means of measuring time waveforms during movement serves as the basis for quality judgment.
Contact Methods and Sample Inspection Stop Movement
Contact methods and offline sample inspection assume stopping or touching the target. Contacting a target moving at high speed can cause deformation or scratches, and measurement during movement is impossible in the first place. Sample inspection misses differences in tracking performance for each operation, and trend management for all parts is also impossible. Without a non-contact, high-speed measurement method that can track temporal changes in position without stopping movement, the basis for quality assurance in transfer and positioning becomes weak.
Measurement Approach to Prevent Missing Transient Behavior
Continuously capture the movement interval, determine the measurable frequency band (measurable band), and perform stable tracking measurement even during transfer.
- 1 Continuously capture movement intervals – STEP ①. With ultra-high-speed sampling of up to 392 kHz, the position of the moving target is continuously captured as a time waveform rather than as points.
- 2 Visualize transient waveforms – STEP ②. Transient behaviors such as rise, settling, and overshoot can be acquired as waveforms to quantitatively evaluate tracking performance.
- 3 Determine the measurable band – STEP ③. Check if the sampling is sufficiently fast relative to the frequency components of the target’s movement. Note that ultra-high-frequency movement will be missed.
- 4 Stable measurement even during transfer – STEP ④. With automatic light intensity control, stable tracking measurement is performed even for transferred workpieces with changing surface conditions.
Comparison of Methods in Displacement Measurement of High-Speed Moving Objects
Depending on the measurement method, there are significant differences in tracking performance during movement/transfer and the ease of acquiring transient waveforms.
Tracking performance during movement/transfer
LK-G5000 Series (Triangulation / Non-contact, ultra-high-speed sampling)
◎ Tracking with ultra-high-speed sampling
Contact method (dial gauge/LVDT)
× Cannot measure during movement
Conventional laser displacement sensor with slow sampling
△ Misses fast movements
Sample inspection/offline measurement
× Requires the target to be stationary/stopped
Capturing transient waveforms (rise/settling/overshoot)
LK-G5000 Series (Triangulation / Non-contact, ultra-high-speed sampling)
◎ Captured as a time waveform
Contact method (dial gauge/LVDT)
× Cannot be captured
Conventional laser displacement sensor with slow sampling
△ Coarse waveform with insufficient reproduction
Sample inspection/offline measurement
× Cannot be captured
Non-contact/influence on target
LK-G5000 Series (Triangulation / Non-contact, ultra-high-speed sampling)
○ Non-contact with no influence
Contact method (dial gauge/LVDT)
× Risk of contact/deformation
Conventional laser displacement sensor with slow sampling
○ Non-contact
Sample inspection/offline measurement
△ Requires removal/jig
Inline 100%/continuous measurement
LK-G5000 Series (Triangulation / Non-contact, ultra-high-speed sampling)
○ Continuous monitoring of 100% of targets
Contact method (dial gauge/LVDT)
× Manual/one-time
Conventional laser displacement sensor with slow sampling
△ Dependent on speed
Sample inspection/offline measurement
× Sample inspection only
Stable measurement of surface conditions/materials
LK-G5000 Series (Triangulation / Non-contact, ultra-high-speed sampling)
○ Stable with automatic light intensity control
Contact method (dial gauge/LVDT)
△ Dependent on target
Conventional laser displacement sensor with slow sampling
△ Unstable on glossy/rough surfaces
Sample inspection/offline measurement
△ Dependent on target
Role (Area of expertise)
LK-G5000 Series (Triangulation / Non-contact, ultra-high-speed sampling)
Transient behavior tracking of moving objects
Contact method (dial gauge/LVDT)
Dimensions of stationary targets
Conventional laser displacement sensor with slow sampling
Low-speed/static non-contact displacement
Sample inspection/offline measurement
Sample inspection in a stopped state
Why Choose the LK-G5000 Series
The LK-G5000 Series combines non-contact measurement using the triangulation method with ultra-high-speed sampling of up to 392 kHz to track and measure the transient behavior of moving/conveyed targets as a time waveform. It captures rise, settling, and overshoot that contact sensors or conventional sensors with slow sampling miss, enabling 100% evaluation inline without stopping movement.
LK-G5000 Series Supporting Displacement and Behavior Measurement of High-Speed Moving Objects
A non-contact laser displacement sensor using the triangulation method. It uses ultra-high-speed sampling to track changes in the position of moving objects over time as a waveform.
Supporting Displacement and Behavior Measurement of High-Speed Moving Objects — LK-G5000 Series
Ultra High-Speed/High-Accuracy Laser Displacement Sensor
This non-contact laser displacement sensor uses the triangulation method to stably capture the displacement of moving targets with ultra-high-speed sampling of up to 392 kHz. Because changes in position over time can be acquired as a waveform rather than points, it is suitable for tracking and measuring transient behavior such as rise, settling, and overshoot. The ABLE II automatic light intensity control function quickly tracks sudden changes in surface conditions, ensuring stable measurement from rough to glossy surfaces. It features more than 20 types of sensor heads that can be selected according to the surface condition of the target and the installation distance. The main controller is equipped with a calculation function, allowing output as velocity or acceleration. It also supports synchronized measurement of up to 12 heads and comes standard with a flexible cable that can be attached to moving parts such as robots.
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Get Detailed Materials on the LK-G5000 Series
You can download a free catalog summarizing sampling speeds, compatible sensor heads, system configurations, and application examples.
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Inquiries regarding displacement measurement of high-speed moving objects
Application Examples of Displacement and Behavior Measurement of High-Speed Moving Objects
It is used for tracking measurements of continuously moving targets, such as positioning stages, engine valves, and IC chips during transfer.
Positioning Behavior Measurement of Equipment Stages
Continuously measures the height of stages that move and position at high speed without contact. Captures transient behaviors such as settling and overshoot as time waveforms for use in evaluating tracking performance.
Valve Behavior Measurement
Tracks and measures the behavior of high-speed valves without contact from a distance. Accurately captures movement distance and speed.
Chip Height Measurement on High-Speed Transfer Lines
Detects chips on trays transferred at high speed with ultra-high-speed sampling to reduce missed measurements. Continuously measures the height at each position even during movement.
Frequently Asked Questions About High-Speed Moving Object Displacement and Behavior Measurement (LK-G5000 Series)
Yes. The LK-G5000 Series uses ultra-high-speed sampling of up to 392 kHz to track and measure changes in the position of moving or transferred targets as time waveforms rather than points, without contact.
In general, a sampling frequency (sampling rate) at least 10 times higher than the frequency components of the target’s movement is required. For ultra-high-frequency movement faster than this, sampling cannot keep up, and calculated peak values will be smaller than actual values. Therefore, use within the measurable frequency band is required.
Yes. Ultra-high-speed sampling continuously captures the movement interval, enabling transient behaviors such as rise, settling, and overshoot to be acquired as time waveforms for evaluating tracking performance.
Yes. Non-contact measurement eliminates the need to stop movement, allowing the height and steps of transferred workpieces to be monitored continuously for 100% of parts. Synchronized measurement with up to 12 heads is also supported.
Vibration and runout primarily deal with the amount by which a fixed point oscillates periodically. This page concerns measurement of the process by which moving or transferred targets move to a target position, including changes in position over time and tracking performance, so the applications differ.
Yes. The ABLE II automatic light intensity control function quickly tracks sudden changes in surface conditions and optimizes received light intensity from rough to glossy surfaces.
Compatible sensor heads, sampling speeds, and system configurations can be found in the catalog or through the inquiry form.
- Ultra High-Speed/High-Accuracy Laser Displacement Sensor LK-G5000 series
Ultra High-Speed/High-Accuracy Laser Displacement Sensor
LK-G5000 series
