Editing Emerging technologies, emerging markets – fostering the innovation potential of research infrastructures

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Photoacoustic absorption spectroscopy is the technique that determines the absorption coefficient, through the measurement of sound, produced on radiation of aerosol particles by laser light (Lack et al. 2006). Part of incoming laser intensity is scattered or transmitted, while the remaining fraction is absorbed by either by light absorbing particles or surrounding gas, Absorbed radiation generated particle heating and increase in pressure, detected by sensitive microphone. Photoacoustic spectrometers have fast response time and are well fitted for airborne applications. A similar technique is used by photoacoustic extinctiometers to measure also scattering coefficient.
 
Photoacoustic absorption spectroscopy is the technique that determines the absorption coefficient, through the measurement of sound, produced on radiation of aerosol particles by laser light (Lack et al. 2006). Part of incoming laser intensity is scattered or transmitted, while the remaining fraction is absorbed by either by light absorbing particles or surrounding gas, Absorbed radiation generated particle heating and increase in pressure, detected by sensitive microphone. Photoacoustic spectrometers have fast response time and are well fitted for airborne applications. A similar technique is used by photoacoustic extinctiometers to measure also scattering coefficient.
  
<div class="tablecaption" id="table22">TABLE 22 STRENGTHS AND LIMITATIONS OF PAS/PAX</div>
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TABLE22STRENGTHSANDLIMITATIONSOFPAS/PAX  
{| class="wikitable"
 
! scope="row" | Strengths
 
! scope="row" | Limitations
 
|-
 
! scope="row" | Better response time compared to filter instruments
 
| Calibration required
 
|-
 
! scope="row" | Can be deployed outside aircraft
 
| Problems have been noticed in very noisy environments (laboratory)
 
|-
 
! scope="row" | No filter/loading corrections are needed
 
|
 
|-
 
! scope="row" | PAX can measure scattering and absorption at the same time
 
|
 
|-
 
|}
 
Producers of PAS are presented in table 23.
 
  
<div class="tablecaption" id="table23">TABLE 23 PRODUCERS OF DEVICES FOR PAS</div>
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TABLE 23 PRODUCERS OF DEVICES FOR PAS  
{| class="wikitable"
 
! scope="row" | Producer name
 
! scope="row" | Website
 
|-
 
! scope="row" | Droplet Measurement Technology
 
| http://dropletmeasurement.com/
 
|}
 
  
 
=====2.2.2.2.2 Absorption photometers/aethalometer=====
 
=====2.2.2.2.2 Absorption photometers/aethalometer=====

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