General - OPSIS Blog

Keep an Eye on Ozone

Bengt Löfstedt
General, AQM
2022-09-16
View Count 6617

Stratospheric ozone is a blessing. It prevents most of the sun’s ultraviolet radiation from reaching the surface of the earth, and thereby protects surface-dwelling life from damaging UV rays. At the same time, ground-level ozone is a major air pollutant. Let’s take a closer look at the latter phenomenon.

Inside the Gas Analyser – the Tuneable Diode Laser

Bengt Löfstedt
General
2021-04-08
View Count 13194

OPSIS is probably best known for its gas analyser systems based on broad-band (“white”) light from xenon lamps and spectrometers or interferometers as the core analysis devices. However, OPSIS also offers an instrument type base on a quite different optical technique – light absorption detected by utilizing a tuneable diode laser. Let’s take a closer look!

Inside the Gas Analyser – the Interferometer

Bengt Löfstedt
General
2021-03-16
View Count 4120

Some OPSIS gas analysers are based on a device called an interferometer. Like a spectrometer, it separates light into its wavelength components, but it’s done in a special and indirect way. Keep on reading to find out how!

Inside the Gas Analyser – the Spectrometer

Bengt Löfstedt
General
2021-02-23
View Count 4965

Several of OPSIS gas analyser types are based on a device called a spectrometer. It separates light into its wavelength components, allowing the analyser to detect light absorption and thereby determine gas concentrations. Let’s take a closer look at how a spectrometer works!

Once Upon a Time – the Founding of OPSIS

Bengt Löfstedt
General
2020-12-17
View Count 4405

In 2020, OPSIS has been in the gas monitoring business for 35 years. How did it all start, and what does “OPSIS” actually mean? Read on to find out!

The Positive of Negative Numbers

Bengt Löfstedt
General
2020-03-13
View Count 4263

You may have seen a gas concentration reported as less than zero, and that may have made the alarm bells go off. There can of course not be less than no molecules present in the air. But it doesn’t have to mean that the monitoring equipment is bad, it can just as well be valuable data. Let’s take a closer look on how that works!

Global Warming – a Hot Topic

Svante Wallin
General
2019-02-08
View Count 3622

WMO reports that the global average surface temperature in 2018 was approximately 1°C above pre-industrial baseline.

What is the Difference between a PM2.5 Monitor and a PM10 Monitor?

Bengt Löfstedt
General, AQM
2018-04-04
View Count 12855

There are several similarities between a PM_2.5 Monitor and a PM₁₀ Monitor, but there are also some differences. Let us explain how and why.

DOAS Explained

Bengt Löfstedt
General
2017-11-21
View Count 18792

DOAS stands for Differential Optical Absorption Spectroscopy. The DOAS technique was conceived almost a century ago, and it was applied on research level to air quality monitoring already in the 1970s.