FAQ No. FAQ00471
Question
Can the ZX-L-N measure transparent objects?
Answer
Transparent objects, which allow light to pass through, cannot be
measured because Reflective Smart Sensors use a PSD and Through-beam Smart
Sensors use a PD. If the transparency and required accuracy are low, it
might be possible to use the ZX-L-N for some applications. We recommend that
you conduct tests with the actual object first. If the transparency and
required accuracy are high, the following Sensors can be used to measure
transparent objects.
Reflective Sensors: Measuring the distance
to the top of the transparent object
•
ZS-HLD/-LD Series Smart Sensors (2D CMOS Laser Type)
The above Sensor is suitable for measuring
transparent objects.
Sensing with a PSD (Not suitable for transparent
objects)
A Regular Reflective Sensor that uses a PSD cannot distinguish the light
reflected from the surface because it is affected by the light reflected
from the other side of the object and/or the background. For this reason,
displacement of the surface cannot be accurately measured. A Diffuse
Reflective Sensors cannot make measurements because the diffused light is
too small.
Sensing with a CCD
A Regular Reflective Sensor with a CCD can extract the light reflected
from the surface because it can distinguish between the light reflected
from the surface and the light reflected from the other side. For this
reason, displacement of the surface can be accurately measured without
being affected by the light reflected from the other side and/or the
background.
Through-beam Sensors
ZX-GT Series Smart Sensor (Wide
Laser Beam CCD Measurement Type)
The above Sensors can detect the edge of transparent objects by using a
CCD in transparent object detection mode.
|
Measurement method and product |
Structure |
Features |
Application |
|
CCD, Z4LC Parallel Beam Line Sensor |
One-dimension CCD Image Sensor.
Pixel data can be obtained. Position information can be output. |
• High-precision linearity (±0.1% FS)
•
Compact body |
• Determining outer diameters
•
Detecting edge positions (including transparent objects)
•
Determining pin pitch
•
Detecting bar positions |
3Z4L-series Laser Micrometers
The above Micrometers can be used to detect the outer diameter or edge
position of transparent objects using a laser scan method as the
measurement principle.
|
Measurement method and product |
Structure |
Features |
Application |
|
Laser scan, 3Z4L Laser Micrometer |
Scans a narrow light beam.
Measures the outer diameter by taking the time that the light is
blocked as the width. |
• High cost
•
High-precision linearity (±0.01% FS max.)
•
Outer dimension is large |
• Determining outer diameters (including
transparent objects)
•
Detecting edge positions (including transparent objects)
•
Determining pin pitch |
Other Displacement Sensor FAQs
 What is the maximum length that the cable for ZX-L can be extended?
The threshold value cannot be set. What is causing this, and what can be done to resolve it?
How many times can the zero reset be used?
| 
Clearance Centre
