Cloud Combination Probe
The CCP is a multipurpose particle spectrometer that includes three Droplet instruments (CDP, CIP, and LWC) – plus temperature and relative humidity sensors – in a single package. Researchers use the CCP to obtain aerosol particle and cloud hydrometeor size distributions.TALK TO AN EXPERT
PADS – Particle Analysis and Display System
The CCP utilizes PADS software for instrument control and real-time data display. PADS displays a user-friendly virtual instrument panel that enables the user to do the following tasks:
- Start data recording and sampling
- View particle image data acquired with the CIP
- View particle volume and number concentrations, as well as Median Volume Diameter (MVD) and Effective Diameter (ED)
- View LWC as measured or calculated by the hotwire sensor, CIP, and CDP
- Monitor instrument parameters like CIP laser current and various electronics voltages
- Play back data for post-flight viewing
Particle imaging and particle light-scattering
The three Droplet instruments included in the CCP are the Cloud Imaging Probe (CIP), the Cloud Droplet Probe (CDP), and the Hotwire Liquid Water Content Sensor (Hotwire LWC).
- Shadow images of particles passing through a collimated laser beam are projected onto a linear array of 64 photodetectors to determine presence of particles.
- Particle images are reconstructed from individual “slices,” where a slice is the state of the 64-element linear array at a given moment in time.
- The CDP is a forward-scattering optical spectrometer that accepts and sizes only particles that pass through a region of the laser beam with uniform power.
- Forward-scattered light is collected, directed through a 50/50 optical beam splitter, then measured by photodetectors to determine size and depth of field.
- The LWC features a coiled wire that is maintained at 150 °C, which acts as variable resistance in a Wheatstone Bridge circuit.
- The resistance of the sensing coil is directly proportional to its temperature.
- Power dissipated by the sensor to maintain temperature is used to calculate vaporization, and in turn, liquid water content.
|Parameter||CIP Specification||CDP Specification||LWC Specification|
|Technique||Optical Array Probe with 64 elements: 62 sizing elements, end diodes reject||Light-scattering probe with 30 size bins||Temperature-Controlled Hotwire Sensor|
|Measured Particle Size Range||12.5 µm – 1.55 mm (standard)||2 µm to 50 µm||N/A; measured LWC range is 0 - 3 g/m3|
|Sample Area||Variable; depends on tip configuration and particle size||0.24 mm2||N/A|
|Upper Concentration Range||Depends on particle size, but up to 500 particles/ cm3 for a CIP with standard tips and arm width||2,000 particles/cm3||3 g/m3|
|Air Speed Range||10 - 300 m/s for 25 μm resolution CIP; 10 - 180 m/s for 15 μm CIP||10 - 250 m/s||10 - 200 m/s|
|Number of Size Bins||62||30||N/A|
|Sampling Frequency||1D histogram data: 0.05 to 25 Hz 2D image data: variable interval, when buffer fills||Selectable, 0.05 to 25 Hz||N/A|
|Laser||658 nm, 30 mW||658 nm, ~50 mW||N/A|
|Non-absorbing Refractive Index||N/A||1.33 (the industry standard for water)||N/A|
|Light Collection Angles||N/A||4° - 12°||N/A|
|Auxiliary Parameters||Ambient Temperature Relative Humidity Static Pressure Dynamic Pressure||N/A||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||29 lbs./13.2kg for probe and canister|
|Power Requirements||System Power bus: 28 VDC, 3A Auxiliary bus (formerly “LWC bus”): 28 VDC, up to 8A (depends on LWC content) CIP Anti-Ice bus: 28 VDC, 13A CDP Anti-Ice bus:28 VDC, 7A|
|Environmental Operating Conditions||Temperature: -40 °C to +40°C (-40 °F to +104 °F) RH: 0 – 100%, non-condensing Altitude: 0 - 50,000 ft|
- PADS software and laptop
- Data Acquisition System
The Lifecycle Care Program ensures instrument integrity and performance vital to your research mission for 3 years or 3 calls (whichever comes first). When conducting complex and time intensive laboratory or field measurements it is critical to avoid down time, and ensure data collection accuracy. The program consists of 3 key deliverables for each year or call:
- Instrument Logistics
- Instrument Integrity
- Instrument Performance
Lifecycle Care Program Includes:
- Shipping to and from Droplet Measurement Technologies facility
- Customs handling, including CARNET ATA if required
- Incoming instrument evaluation and health check
- Software and firmware validation
- 100%-unit functionality test
- Calibration data
- Calibration report
- Certificate of calibration
At times, our technician might discover an instrument issue, which might not be covered by the Lifecycle Care Program or by our product warranty. In such case we will reach out to you with a service & repair estimate to allow you to provide us with the next steps of action.
Arctic low-level boundary layer clouds:in-situ measurements and simulations of mono- and bimodal supercooled droplet size distributions at the cloud top layer
An instrumented Basler BT-67 research aircraft operated out of Inuvik over the Mackenzie River delta and the Beaufort Sea in the Northwest Territories of Canada.Read More