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Photoacoustic Extinctiometer（PAX）

The Photoacoustic Extinctiometer is Droplet’s premier instrument for measuring aerosol optical properties.

Product Description The PAX is a sensitive, high-resolution, fast-response instrument for measuring aerosol optical properties relevant for climate change and carbon particle sensing.

Advantage Characteristics

Technical Parameter

Application Scope

Classic Cases

Advantage Characteristics

Achieve excellent scattering coefficient sensitivity with reciprocal nephelometry. Count on fast response, one-second resolution Real-time data display on a high-resolution touch screen. Get continuous and autonomous operation, with no filter collection required and no filter data artifacts.

Get accurate measurements for both light absorption and scattering in a single instrument. Then correlate the absorption measurement black carbon mass concentration. Select from three wavelengths (870 nm [standard], optional 405 nm, or 532 nm), and get wide dynamic range suitable for pristine regions to source sampling.

Technical Parameter

Measured parameters Absorption coefficient, Babs Scattering coefficient, Bscat
Auxiliary parameters Temperature Pressure Relative Humidity
Derived parameters Black carbon (BC) mass Extinction coefficient, Bext Single scattering albedo, SSA Dew Point
Measurement range – absorption and scattering < 1 Mm-1 – 10,000 Mm-1 (870 nm, 60 sec. averaging)
Laser 870 nm (1.4 W) Modulation Frequency: 1500 Hz nominal, square wave
Angular integration for scattering 6° to 174°
Sample flow 1 L/min Flow Control: Critical orifice Diaphragm Pump
Response time < 10 sec; one-second resolution
Data averaging time 1, 10 or 60 seconds, user selectable
Zero check On demand, or automated at user selectable interval at 5, 15, 20, 30, or 60 minutes. Zero check with high-efficiency filtered air sample.
Computer requirements for PMC software (computer not included) Windows XP, Vista, or Windows 7 Minimum 1GB RAM
Front panel features Graphical color touch-panel display screen Two USB-A ports Power switch User interface via touch screen or standard keyboard
Rear panel connections Sample inlet (compression fitting for ¼” tube) Pump exhaust (compression fitting for ¼” tube) AC and DC power connections Serial RS-232 jack Ethernet port Two analog BNC inputs Four analog BNC outputs
Communications output Ethernet 100/10 Mbps, RS-232 Serial
Power requirements 90 – 264 V, 47 – 63 Hz (AC Power) or 12 VDC Power Consumption 45 W
Dimensions 18 cm H x 48 cm W x 61 cm D (7
Weight 18 kg (40 lb)
Environmental operating conditions Temperature: 0 – 40°C (32 – 104°F) RH: 0 – 90% RH non-condensing