LAAPTOF - Updates AMS users meeting 2012 2013 1
Instrument AMS users meeting 2012 2013 2
Spectra (oxalic acid) AMS users meeting 2012 2013 3
Spectra (Arizona test dust) AMS users meeting 2012 2013 4
Data sheet Transmitted particles sizes: Detected particle sizes: Detection laser: Ionization laser: Mass range : ~70 nm 700 nm 200 nm λ = 405 nm, p = 100 mw each. excimer laser, λ = 193 nm, E pulse = 10 mj 1 Th to ~ 200 Th Mass resolving power (fwhm): m / Δm = 600-800 (@ m/z = 184) Size: Weight: Electrical power: 80 cm x 76 cm x 76 cm, (31.5'' x 30'' x 30'') ~120 kg ( ~ 265 lb) < 700W AMS users meeting 2012 2013 5
Hardware developments Old detection laser: AMS users meeting 2012 2013 6
Hardware developments New detection laser: AMS users meeting 2012 2013 7
Hardware developments Scattering laser assembly: Connection diode driver Diode Copper housing (threaded) Vacuum seal Aperture / Optical filter Beam exit AMS users meeting 2012 2013 8
Hardware developments Triggerbox: communication protocoll changed from ASCII to binary... thus no longer useful output on hyperterm (particle size). But... AMS users meeting 2012 2013 9
IgorDAQ IgorDAQ is an Igor based control program for the LAAPTOF All critical components of IgorDAQ are written as XOP Controls measurement ( start / hold / stop ) Monitors instrument status Monitors and shows parameters and status of current measurement Instrumental parameters can be controlled and set (e.g., trigger thresholds) Particle size and instrumental parameters are stored together with the mass spectra AMS users meeting 2012 2013 10
IgorDAQ Main Display Current spectra Current instrument status Current particle size distribution Size of the last particle Detection efficiency # of particles in current run AMS users meeting 2012 2013 11
IgorDAQ Parameters Set mass calibration for positive and negative mode Insert ptof calibration will be applied to the main ptof display (and stored) Select serial port for communication with LAAPTOF (if autodetect fails) AMS users meeting 2012 2013 12
IgorDAQ Parameters Set mass calibration for positive and negative mode Insert ptof calibration will be applied to the main ptof display (and stored) Select serial port for communication with LAAPTOF (if autodetect fails) Future versions: set ToFDAQ parameters Sync time with PC AMS users meeting 2012 2013 13
IgorDAQ Triggerbox Set thresholds for front and back scattering units Select the current trigger mode (Both lasers, Second laser only, Auto trigger) Select serial port for communication with Triggerbox (if autodetect fails) AMS users meeting 2012 2013 14
IgorDAQ Triggerbox Set thresholds for front and back scattering units Select the current trigger mode (Both lasers, Second laser only, Auto trigger) Select serial port for communication with Triggerbox (if autodetect fails) Next version: easier tuning of thresholds AMS users meeting 2012 2013 15
IgorDAQ Saving Location for saving the recorded data Prefix for the current measurements each file name consists of this prefix and a time- /datestamp The maximum number of particles in a file AMS users meeting 2012 2013 16
IgorDAQ TPS (under development) Currently TPS controlled via browser Next version of IgorDAQ will allow direct control of TPS settings Settings will be saved with each run/file AMS users meeting 2012 2013 17
LAAPTOF Data Analysis Igor based tool to load and analyse LAAPTOF data Offers basic features: Preliminary treatment of spectra (removal of excimer signal) Baseline correction Filtering spectra Advanced features: Initial mass calibration Exact mass calibration (will make a calibration curve for each spectrum) Stick calculation Fuzzy (cmeans) clustering AMS users meeting 2012 2013 18
LAAPTOF Data Analysis 1. Load a data file 2. Display the raw spectra AMS users meeting 2012 2013 19
LAAPTOF Data Analysis 1. Load a data file 2. Display the raw spectra 3. Preprocess spectra Remove excimer peak Correct baseline Filter spectra (if necessary or needed) AMS users meeting 2012 2013 20
LAAPTOF Data Analysis 1. Load a data file 2. Display the raw spectra 3. Preprocess spectra Remove excimer peak Correct baseline Filter spectra (if necessary or needed) 4. Mass calibration Initial calibration Exact calibration (for each spectrum) AMS users meeting 2012 2013 21
LAAPTOF Data Analysis 1. Load a data file 2. Display the raw spectra 3. Preprocess spectra Remove excimer peak Correct baseline Filter spectra (if necessary or needed) 4. Mass calibration Initial calibration Exact calibration (for each spectrum) 5. Stick calculation 6. Fuzzy clustering AMS users meeting 2012 2013 22
LAAPTOF Data Analysis Parameters: AMS users meeting 2012 2013 23
LAAPTOF Data Analysis At the moment only used for PToF calibration The current parameters and curve are shown Known calibration parameters can be entered A new calibration can be calculated from known size standards The new calibration is immediately applied to the data Future versions will show the ToF-Parameters and calibrations (export to IgorDAQ) AMS users meeting 2012 2013 24
Under development... Batch processing for fuzzy clustering (i.e., automatic processing of 2 to x classes with the possibility to repeat each calculation y times) Possibility to export data in other formats (e.g., YAADA compatibility) SQL database and Igor interface for storing spectra as well as clusters Users can generate a database of different standards (lab based measurements) These can then be used and compared with data obtained in the field AMS users meeting 2012 2013 25
Thank you for your time AMS users meeting 2012 2013 26