Cloud, Aerosol, and Precipitation Spectrometer with Depolarization（CAPS）

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The CAPS is a multipurpose, research-grade cloud spectrometer which is made by Droplet Measurement Technologies.

Product Description The CAPS is a multipurpose, research-grade cloud spectrometer that includes three Droplet instruments (CIP, LWC, and CAS); temperature and relative humidity sensors; and polarization measurement to discriminate between water and ice.

Advantage Characteristics

Technical Parameter

Application Scope

Classic Cases

Advantage Characteristics

Gather data on particle optical properties (refractive index), as well as particle shape assessments (discrimination between water and ice for probes with depolarization feature). Combine multiple probes with ranges optimized to measure cloud particles prior to and during transition to precipitation.

CAS measures aerosol particle and cloud hydrometeor size distributions from 2 µm to 50 µm; CIP measures precipitation size distributions from 25 µm to 1550 µm, and LWC measures liquid water content from 0.01 g/m³ to 3 g/m³ , along with aircraft velocity, and atmospheric temperature and pressure.

Technical Parameter

Technique CIP: Optical Array Probe with 64 elements: 62 sizing elements, end diodes reject; CAS: Forward- and Back-Scatter Light Sensors; LWC: Temperature-Controlled Hotwire Sensor
Measured particle size range CIP：12.5 µm – 1.55 mm (standard)；CAS：0.51~50μm；LWC：N/A；0~3g/m³
Sample area CIP：10 cm x 1.55 mm；CAS：11.1 mm x 120 µm; LWC：N/A
Upper concentration range Hotwire LWC: 3g/m³
Air speed range CIP：10~300m/s；CAS：10~200m/s；LWC：10-200m/s
Number of size bins CIP：62；CAS： Selectable; 10, 20, 30, or 40；LWC：N/A
Sampling frequency CIP：1D histogram data: 0.05 to 40 Hz 2D image data: variable interval, when buffer fills；CAS：Selectable, 0.05 to 40 Hz；LWC：N/A
Laser CIP：658nm，30mW；CAS：658nm，~50mW；LWC：N/A
Light-scattering parameters CIP: N/A；CAS: Non-absorbing refractive index: 1.3 – 1.7 Light collection angles: 4° - 12°, 168° - 176°；LWC：N/A
Auxiliary parameters CIP:Ambient Temperature, Relative Humidity, Static Pressure, Dynamic Pressure (CIP)；CAS: N/A； LWC: N/A
Data system interface: 2D CIP data: RS-422, High Speed, 4 Mb/sec Baud Rate System data: RS-422, 56.6 kb/sec Baud Rate
Weight 45 lbs./20.4 kg
Power requirements 28VDC: 10A for probe system, and 45A for anti-ice heaters, optional AC voltages for anti-ice heaters
Environmental operating conditions Temperature: 0 – 40°C (32 – 104 °F) RH: 0 – 100%, non-condensing