LDC-X200 Bars Laser Diameter Measuring System

LDC-X200 Laser Diameter Measurement System


Overview

The non-contact diameter measuring system, is mainly used in the measurement
of the outer diameter of various wire rods, bars, wires and pipes. The
system can detect the change of the diameter (outer diameter) of the
measured object in real time under the high temperature state.



The working principle

The diameter measuring system takes the laser scanning method as an example.
It adopts the probe imported from Japan, which can achieve an accuracy of
plus or minus 2 microns in the range of 0.3 to 30 mm. The acquisition
frequency reaches 2000 times/second. The probe uses a self-excited infrared
light source, which overcomes the measurement problem in dim environments.

It adopts the measurement method of pulse parallel light scanning, and has a
strong ability to resist the jitter of the measured object. (As shown in
Figure 1) Since the shaking frequency of the measured object is much smaller
than the scanning frequency, when the measured object A moves in the
shakeable area, the measurement result will be able to ensure its accuracy
because the time it blocks the beam does not change.



Figure 1: Probe Scanning Radiation Area



The detection principle is as follows



Figure 2: Working Principle



First, the crystal oscillator generates self-excited high-frequency pulses,
which are sent to the comparator and the stepping servo motor respectively.
The stepping servo motor drives the octahedral prism to rotate at a high
speed, and reflects the infrared laser emitted by the laser generator to the
convex lens A. It becomes parallel light, and then collects on the
photosensitive element C through the convex lens B in the infrared receiving
probe. The photosensitive element C converts this signal into a
corresponding electrical signal and sends it to the other end of the
comparator to compare with the original signal.

When there is no object to be measured in the measuring probe, the pulse
signal at both ends of the comparator will be the same. Therefore, there is
no difference output: when there is an object to be measured in the
measuring probe, the photosensitive element C will output no pulse signal
during the period of scanning through the object to be measured. Therefore,
there will be a difference input for a period of time at both ends of the
comparator, which corresponds to the diameter of the measured object. By
calculating the oscillation period of the pulse and the length of the time
slice without pulse, the diameter of the measured object can be known.



The composition and functions of the system

The system consists of the following main parts (as shown in Figure 1)


1. A measurement frame with four pairs of high-frequency laser scanning
probes and non-contact infrared thermometers is installed

2. Four intelligent signal processors connected with four pairs of high
frequency laser scanning probes

3. Cold air blowing system for cooling and cleaning the measuring frame

4. High-performance intelligent controller responsible for front-end data
signal processing and network communication

5. Data processing and analysis system installed with industrial grade PC,
monitor and printer

Minimum Order: 1 pieces

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