Use at High Ambient
Temperatures and
with Glowing Objects
Challenges with High Ambient Temperatures and Hot Materials
High Emissivity
Solution:
The laser distance sensors with time-of-flight technology are reliable when measuring red glowing objects.
The laser distance sensors triangulation with blue laser enable particularly accurate measurements of glowing objects.
Temperature sensors using infrared radiation are suitable for contactless temperature measurement.
Mirrorings and Reflections from Hot Media
Solution:
Time-of-flight laser distance sensors enable reliable measurement of hot and liquid media. The sensors are able to detect several objects in the measuring range and to suppress the disturbing reflections. This makes it possible to separate the relevant signal of the liquid medium from the signal of a disturbing background. In this way, the measurement signal remains stable even under challenging conditions, such as with reflective liquids.
Extreme Ambient Conditions
Solution:
The 2D/3D profile sensors are suitable for high-resolution measurement of glowing objects. At extreme temperatures, the protective housing provides additional protection for the profile sensor.
The P3 laser distance sensors triangulation offer precise object measurement with high temperature fluctuations.
Ambient Temperature up to 250 °C
Solution:
The sensors for the high temperature range are distinguished by their robust and particularly heat-resistant housing design.
Temperature-resistant glass fiber-optic cables are suitable for confined spaces. Signal evaluation takes place externally via the fiber-optic amplifier outside the high temperature range.
The Advantages of Blue Laser on Red Glowing Surfaces
General Information on the Light Spectrum
Blue light has a wavelength of 380 to 500 nm and is characterized by a high energy density.
- Red light, on the other hand, has a wavelength of 640 to 690 nm and a lower energy density than blue light.
Signal from Red and Blue Laser on Glowing Surface
Blue laser light offers the advantage of delivering reliable and precise measurement results on red glowing surfaces. This is because a sensor with blue laser light only allows blue wavelengths through its bandpass filter, while other spectral ranges are blocked. This filters out the red and infrared light emitted mainly by glowing objects. Only the blue laser light from the sensor reaches the optics and generates a stable signal on the line.
In contrast, the bandpass filter of a sensor with red laser naturally lets red light through to capture the sensor’s own laser light. However, since red and infrared light are spectrally close together and the bandpass filter always allows a small wavelength range, infrared light can also pass through the bandpass filter. Since glowing objects mainly emit red and infrared radiation, these disturbing wavelengths also reach the line. This leads to a significant reduction in the sensor signal. As the blue laser blocks the interfering waves, a more stable and accurate measurement is possible.
Industries with High Temperatures and Glowing Objects
Fill-Level Measurement with Liquid Aluminum
Casting aluminum bars is a central process in the casting industry. The fill level of the liquid aluminum, which reaches a temperature of 700 °C, must be monitored. However, the extreme heat creates a reflective surface that can strongly reflect light rays and influence the measurement.
Solution:
Thickness Measurement with Annealed Metal
Thickness measurement of annealed metal plays a crucial role in industrial processes such as metal or steel production. The extremely high temperatures present a challenge as they could damage conventional sensors due to the heat or affect their accuracy. Due to the glowing surface, red laser light penetrates deep into the surface and can make measurements unreliable.
Solution:
Overview of Solutions
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Machine Vision
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Benefits of machine vision
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Product Flyer for High Temperatures and Glowing Objects
This document provides an overview of the P3 series laser distance sensors.
This document contains the brochure on long-range laser distance sensors with wintec (wenglor interference-free technology).
This document contains the product flyer for the inductive sensors for extreme temperature ranges.
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