Gas Detection 15 What is quantitative optical gas imaging?


Quantitative optical gas imaging is the ability to utilize optical gas imaging – specifi cally, cooled hydrocarbon OGI – combined with an algorithmic solution, to quantify gas leaks invisible to the naked eye.


These are leaks you’d normally be able to visualize on your OGI camera. Historically, OGI cameras have been limited to qualitative analysis – indicating that a leak is occurring but giving little indication how much is leaking. Now, though, combining an existing OGI camera with a qOGI solution, you can visualize and quantify such leaks in units of mass and volumetric leak rates, as well as concentration over pathlength (ppm-m).


What are the minimum and maximum size leaks that can be successfully quantifi ed with the FLIR QL320?


The minimum size of a leak that can be quantifi ed is a function of the ∆T (between ambient temperature near the gas and the background), the compound you are imaging, and the wind speed. FLIR’s QL320 system has demonstrated the ability to quantify propane leaks down to 100 scc/min and methane leaks down to 300 scc/min with a ∆T of 5°C and a moderate wind speed.


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New, sub-miniature, low-cost, high sensitivity and fast-response detector with built-in preamplifi er provides the ideal choice for industrial gas analysis applications


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Hamamatsu has developed a new InAsSb photovoltaic detector (P16702-011MN) with built-in preamplifi er offering high sensitivity to mid-infrared light, up to 11 micrometers (μm) in wavelength. Hamamatsu achieved this by combining the latest InAsSb (indium arsenide antimonide) mid-infrared detector with their unique circuit design technology. Compared to Hamamatsu’s previous detector modules with same level of sensitivity, the P16702-011MN size and cost is drastically reduced, and it exhibits fast response time. This makes it an ideal choice for portable gas analysers able to immediately analyse exhaust gas components at measurement sites around factories.


The P16702-011MN is a compound semiconductor photodetector with built-in preamplifi er for electrical signal amplifi cation.


Each molecule has its own vibration and absorbs infrared light at a specifi c wavelength determined by its energy. This property can be used to analyse and identify the type and quantity of


chemical components contained in a sample. Therefore, mid-infrared light is widely utilised in the analysis of nitrogen oxides and sulphur oxides contained in exhaust gases from factories, etc.


To meet needs in applications such as gas analysis and monitoring of processing laser equipment, Hamamatsu develop and sell InAsSb mid-infrared detectors and detector module products with enhanced sensitivity, by integrating these with electronic circuits and components including preamplifi ers. To keep up with the growing market demand of further downsizing equipment, Hamamatsu have been working on a sub-miniature, low-cost mid-infrared detector device that also offers high-speed response.


In designing this new device, Hamamatsu adopted the latest back-illuminated type InAsSb mid-infrared detector with a sensitivity 1.5 times higher than the regular type. Hamamatsu encapsulated it into a small cylindrical package with a diameter of approximately 9 mm. The device was drastically downsized to about 1/200th the volume of Hamamatsu’s module products, yet it still offers the same level of sensitivity capable of detecting mid-infrared light at wavelengths up to 11 μm. What’s more, the wiring in the package is optimised to increase the response speed up to 100 megahertz, which is twice as high as Hamamatsu’s module products, thus improving measurement accuracy. It also has a lower manufacturing cost since the number of required components was reduced.


The P16702-011MN will speed up the replacement of mercury-cadmium-telluride (MCT) infrared detectors which is currently the mainstream in high-precision mid-infrared spectroscopy but contains toxic substances restricted by the RoHS Directive (*1). Hamamatsu Photonics is one of the few companies in the world that manufacture both photodetectors and light sources. Using the P16702-011MN in conjunction with a quantum cascade laser or QCL (*2), which they also manufacture, allows making measurements at even higher speeds, resolution, and sensitivity.


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New 24/7 Professional Monitoring service enhances safety platform to provide peace of mind that worker safety is monitored around the clock.


Industrial Scientifi c have announced the release of 24/7 Professional Monitoring. 24/7 Professional Monitoring offers iNet® Now users the option to rely on real- time response centre monitoring for gas exposures and panic or man-down alarms.


With 24/7 Professional Monitoring, call centre agents continuously monitor gas detector readings and escalate incidents according to a confi gurable response plan around the clock. When an alarm is triggered on a worker’s gas detector, an agent will follow a designated response plan until the alarm is addressed safely. By using 24/7 Professional Monitoring, workers get the help they need while increasing site effi ciency and capacity to handle other priorities.


“With millions of remote or isolated workers, safety monitoring can be hard to navigate. Traditional approaches can be ineffi cient and labour intensive for workers and supervisors. With our new 24/7 Professional Monitoring service, we offer a low- cost, reliable way to ensure that a user’s safety alarms are always addressed,” said David Sawyer, Product Manager, iNet Exchange & Services at Industrial Scientifi c. “And with dynamic user assignments, users don’t have to worry about carrying the same device every day—they can choose any device from their fl eet and know that someone will always respond when needed.”


24/7 Professional Monitoring further strengthens Industrial Scientifi c’s iNet safety platform, which includes iNet Now Live Monitoring, iNet® Exchange Gas Detection as a Service, iNet® Control Gas Detection Management Software, and SAFER One™ Dynamic Plume Modelling.


The iNet safety platform combines industry-leading detector technology, innovative software and services, and a commitment to impactful innovation. By using it in whole or in part, teams can streamline operations, ensure device readiness, enhance visibility into worker and site conditions, respond faster during emergencies, and more — all while ensuring worker health and safety.


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