defr Glossar

Attenuation of the radiant flux when light is passed through a clear medium.

If light of a suitable wavelength is passed through a sample, part of the energy is transmitted to the molecules. As a result, the emergent beam Φout has less energy than the incident beam Φin

Absorption
Fig. 2: Absorption

The amount of light absorbed generally follows the Lambert-Beer Law and is therefore proportional to the number of absorbing molecules and the path length traversed L. Absorption spectroscopy; Extinction

If the medium contains turbidity matter, additional attenuation is caused as a result of light scattering. Scattered light

Terms related to absorption spectroscopy:
Lambert-Beer Law: $\phi_{\text{out}} = \phi_{\text{in}} \cdot 10^{- \kappa \cdot c \cdot L}$
Absorbance:
(previously referred to as "extinction E")
$A = \log_{10} \left( \frac{ 1 }{ \tau } \right) = \log_{10} \left( \frac{\phi_{\text{in}}}{\phi_{\text{out}}} \right)$
Absorption coefficient: $a = \left(\frac{A}{L}\right) \quad a = \kappa \cdot c$
Transmittance: $\tau = \left(\frac{ \phi_{\text{out}} }{ \phi_{\text{in}} }\right)$
$\phi_{\text{out}}$ Radiant flux (or radiant power), transmitted
$\phi_{\text{in}}$ Radiant power, received
$\kappa$ Relative absorption coefficient (previously referred to as "extinction coefficient ε")
$c$ Concentration in mol/l
$L$ Path length in cm
Index

Contact distribution partner

{{selectedCountry.Name}} {{country.Name}}

Please select your businessarea

{{ba.Name}}

Please select

{{area.Name}}

Please select your businessarea

{{ba.Name}}
{{selectedCountry.Name}} {{country.Name}}
{{vm.getBusinessAreaStringByVendor(vendor)}} {{area.Name}}
{{vm.getBusinessAreaStringByVendor(vendor)}}
René Gehri
Water, Beverages & Food, Industrial Processes
Pascal Schärer
Traffic & Environment

Contact headquarters

Felix Joller
Sales Manager ScrubberGuard
Öffnungszeiten:
Montag–Freitag 08:00–12:00 und 13:30–17:00
Feiertage & Betriebsferien:
Ostern: 15. – 18. April 2022, Auffahrt: 26. Mai 2022, Pfingstmontag: 06. Juni 2022, Fronleichnam: 16. Juni 2022, Bundesfeiertag: 01. August 2022, Maria Himmelfahrt: 15. August 2022, Allerheiligen: 01. November 2022, Maria Empfängnis: 08. Dezember 2022, Betriebsferien: 24. Dezember 2022 – 02. Januar 2023
Opening hours:
Monday–Friday 08:00am–12:00pm und 1:30pm–5:00pm
Public & company holidays:
Easter: 15. – 18. April 2022, Ascension Day: 26. May 2022, Whit Monday: 06. June 2022, Corpus Christi: 16. June 2022, Federal Holiday: 01. August 2022, Assumption Day: 15. August 2022, All Saints Day: 01. November 2022, Conception of Mary: 08. December 2022, Company holidays: 24. Decmber 2022 – 02. January 2023