General - OPSIS Blog

Spring is in the Air

Bengt Löfstedt
General
2023-03-16
View Count 252

At the home of OPSIS, the phrase ‘spring is in the air’ is an established saying which means long-awaited warmer and longer days and the sense of a new beginning. But what’s in the air in the spring, really? Let’s take a look at seasonal variations of air pollution!

Good Averages, on Average?

Bengt Löfstedt
General
2023-03-13
View Count 441

We all know how to calculate the average of a set of values: add the individual values and then divide by the number of them. Right? Yes, almost always right, but if you work with air quality and specifically meteorological data, you must sometimes think a little further.

Keep an Eye on Ozone

Bengt Löfstedt
General, AQM
2022-09-16
View Count 5689

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 12116

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 2951

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 3849

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 3550

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 3600

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!