LANmeter proves itself useful at AT&T
March 2001
Fieldbus & Industrial Networking
Two-colour ratio measurement explained.
In production as well as in quality control and maintenance, temperature represents an important indicator of product quality or equipment conditions. Advances in detector and optical technology of infrared thermometers are helping to expand the types of applications where IR can be used effectively and yield a better return on investment. Difficult Applications involving high temperatures and environments with smoke and dust are now being overcome using the principles of two-colour ratio measurement.
A two-colour instrument uses two detectors at two wavelengths looking at the same hot target. The graph (Figure 1) shows the blackbody curve for a target at 1500°C and an emissivity of 1,0. Detector 1 puts out 500 units of energy at that temperature and detector 2 puts out 1000 units. This is called a ratio thermometer; dividing the signal of 2 by that of 1 we get a ratio of 2. Therefore, the number 2 indicates the target is at 1500°C.
Now let us introduce factors to degrade the measurement. Let the lens get dirty, do not fill the optical spot, dust in the way and eventually as much as 90% of the signal can be lost.
Figure 2 is the same graph with a second curve added that shows the 1500°C target but with the emissivity reduced by 90% ie, it is now 0,1. The signal from detector 1 is 50 units and from detector 2 it is 100 units. The ratio is also 2 and the instrument says the temperature is still 1500°C even though 90% of the signal has been lost. This is the advantage of two-colour measurement in this application.
R&C Instrumentation invites interested readers to contact them to get the brochure ‘Principles of Infrared Temperature Measurement’ which covers the theory of infrared temperature measurement including single and two-colour ratio measurement.
Further reading:
Suppression and safety solutions for fire and gas in mission-critical industries
Fieldbus & Industrial Networking
By representing world-leading brands and focusing on fully integrated, certified systems, HMA South Africa is positioning itself as a trusted partner in fire detection, suppression and explosion-proof safety solutions across the continent.
Read more...
Integrating fire alarm systems into building management systems
Beckhoff Automation
Fieldbus & Industrial Networking
Fire alarm systems work independently of the building automation system. Schrack Seconet has developed a flexible gateway using ultra-compact industrial PCs and TwinCAT from Beckhoff, which can be used to flexibly convert a customer-specific communication protocol to a wide range of transmission standards.
Read more...
Premium unmanaged industrial switch
Vepac Electronics
Fieldbus & Industrial Networking
Premium unmanaged industrial switch for long-distance, noise-free fibre connectivity
Read more...
Fire and gas suppression solutions for mission-critical industries
Fieldbus & Industrial Networking
By representing world-leading brands and focusing on fully integrated, certified systems, HMA South Africa is positioning itself as a trusted partner in fire detection, suppression and explosion-proof safety solutions across the continent.
Read more...
The future of manufacturing
Fieldbus & Industrial Networking
Industrial automation is evolving at an unprecedented pace. At the forefront of this transformation is the Siemens SIMATIC ET 200SP HA Distributed I/O system. This is a flexible and scalable distributed I/O system for modern signal transfer from the field to the control level.
Read more...
Time-sensitive networking
RJ Connect
Editor's Choice Fieldbus & Industrial Networking
In this article, we will explore what is driving the rise of time-sensitive networking, how it is reshaping industrial efficiency, the challenges when deploying this technology, and ways to tackle these challenges.
Read more...
Loop Signature 30: Nonlinearity in control loops (Part 1)
Michael Brown Control Engineering
Editor's Choice Fieldbus & Industrial Networking
If nonlinearity occurs it means that if one is to carry on controlling with the same response to changes in load or setpoint, then the tuning of the controller will also need to be adjusted to meet the new conditions.
Read more...
PC-based control regulates innovative dehumidifiers
Beckhoff Automation
Fieldbus & Industrial Networking
Swedish company, Airwatergreen is breaking new ground in the dehumidification of air in industrial buildings and warehouses. The patented CVP technology reduces energy requirements and ensures an indoor climate that prevents corrosion and mould growth. PC-based control from Beckhoff regulates this innovative process.
Read more...
Ethernet connectivity for embedded systems
Fieldbus & Industrial Networking
Delivering Ethernet connectivity for embedded systems, XPort ETH Click is a compact add-on board from MIKROE, the embedded solutions company that dramatically cuts development time by providing innovative hardware and software products based on proven standards.
Read more...
Compact mini PC
Vepac Electronics
Fieldbus & Industrial Networking
AS AAEON’s first Intel Core-powered PICO-SEMI system capable of fanless operation, the PICO-MTU4-SEMI from Vepac Electronics is easily deployed as part of larger equipment setups or integrated as the central unit of smart robotics solutions such as AGVs, AMRs and drones requiring minimal maintenance.
Read more...
printer friendly version