The Back-Scatter Cloud Probe (BCP) measures cloud droplet size distributions from 5µm to 75µm, which are then used to derive the total number concentrations, liquid water content (LWC), median volume diameter (MVD), and effective diameter (ED). The BCP’s non-intrusive optical housing allows use in a range of ground-based or airborne applications with no contamination from ice crystal shattering and no airflow distortion.
Advantages:
Classification of particles by size in histogram form
User-programmable sample rates and bin thresholds
Size distributions accumulated in the probe, with serial transmission to computer via any standard RS-232 or RS-422 communications port
Monitoring of multiple variables, e.g. total particles, average transit time, over-range particles, and various probe health indicators
Sleek, Non-Intrusive Design:
The BCP’s aerodynamic design minimizes airflow disturbance and allows for undisturbed particle measurement.
Photo at right: The backscatter cloud probe embedded in simulated aircraft skin.
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Applications:
The BCP is suitable for both airborne and ground-based applications.
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Principle of Operation:
Particles passing through the laser beam scatter light in all directions, but only those photons that transmit within a cone subtending angles between 143° and 169° are collected and directed onto a photodetector (see figure). The photodetector converts the photon pulses into electrical pulses that are transmitted to a signal processor that amplifies and digitizes them. The peak amplitude of the scattering signal is related to the cloud particle size by Mie theory. A size distribution that relates number concentration to each particle’s optical diameter is accumulated at programmable time intervals and stored along with information that monitors the data quality and health of the system.
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Calibration:
The BCP is calibrated at DMT with precision glass beads.
Software:
The Particle Analysis and Display System (PADS) is optional software that provides a user-friendly virtual instrument panel for the control, data display, and data logging of the BCP instrument. For instance, the program enables the user to do the following tasks:
Start data recording and sampling
View a size histogram of particles measured by the BCP
View particle volume and number concentrations, as well as Liquid Water Content (LWC), Median Volume Diameter (MVD) and Effective Diameter (ED)
Monitor instrument operational parameters like optic block temperature, electronic box temperature, and the baseline monitor voltage
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How to Order:
Contact DMT for pricing: +1.303.440.5576,
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