Introducing the ToF-ACSM

27 Pages·2012·1.39 MB·English

by  Mike Cubison

Introducing the ToF-ACSM
62 * 58 * 48 cm
presented by Mike Cubison, Tofwerk AG
Aerodyne ACSM
Aerosol Chemical Speciation Monitor
●
The instrument presented here:
●
has NO CHOPPER
●
has hardware setup optimised for MONITORING
●
It is not the mini-AMS! (Pete is up next to talk about
that)
But it shares many features with it
Design criteria - Hardware
Design criteria - Hardware

Use a TOF spectrometer … !
●
Seek compromise between sensitivity and $$
●
m/dm sufficient for unit-mass analysis with clear baseline determination
●
“E-TOF”
Design criteria - Hardware

Use a TOF spectrometer … !
●
Seek compromise between sensitivity and $$
●
m/dm sufficient for unit-mass analysis with clear baseline determination
●
Minimise size & weight
●
Design criteria - Hardware

Use a TOF spectrometer … !
●
Seek compromise between sensitivity and $$
●
m/dm sufficient for unit-mass analysis with clear baseline determination
●
Minimise size & weight
●
Orientation not constrained
●
The “Taurus”
Design criteria - Hardware

Use a TOF spectrometer … !
●
Seek compromise between sensitivity and $$
●
m/dm sufficient for unit-mass analysis with clear baseline determination
●
Minimise size & weight
●
Orientation not constrained
●
Simple vacuum system
●
Only 2 pumps
Design criteria - Hardware

Use a TOF spectrometer … !
●
Seek compromise between sensitivity and $$
●
m/dm sufficient for unit-mass analysis with clear baseline determination
●
Minimise size & weight
●
Orientation not constrained
●
Simple vacuum system
●
Electronics capable of handling upgraded spectrometer
●
“TPS 2.0”
One TOF power supply for all
Tofwerk spectrometers
Design criteria - Hardware

Use a TOF spectrometer … !
●
Seek compromise between sensitivity and $$
●
m/dm sufficient for unit-mass analysis with clear baseline determination
●
Minimise size & weight
●
Orientation not constrained
●
Simple vacuum system
●
Electronics capable of handling upgraded spectrometer
●
Robust detector
●
can handle atmospheric pressure
●
long lifetime
●
SGE dynode detector
Operation voltage range: 2850 → 4500 V
after 2 months continuous operation we are running at 3000 V
Design criteria - Hardware

Use a TOF spectrometer … !
●
Seek compromise between sensitivity and $$
●
m/dm sufficient for unit-mass analysis with clear baseline determination
●
Minimise size & weight
●
Orientation not constrained
●
Simple vacuum system
●
Electronics capable of handling upgraded spectrometer
●
Robust detector
●
can handle atmospheric pressure
●
long lifetime
●
Data acquisition (DAQ) system
●
Large dynamic range
●
Economical
●
Data rate sufficient for m/dm of spectrometer... and not more
●
Averaging and thresholding → noise suppression
●