Micro Pulse LiDAR
The Micro Pulse LiDAR (MPL) is elastic backscatter LiDAR designed for long-term, autonomous aerosol and cloud monitoring. Pulses of energy are transmitted into the atmosphere; the energy scattered back to the transceiver is collected and measured as a time-resolved signal, thereby detecting clouds and aerosols in real time. MPL data can be used for measurement of cloud boundaries, calculating cloud phase and depolarizing aerosols, cloud scattering cross sections and optical thicknesses, planetary boundary layer heights and aerosol extinction and optical thickness profiles, including those into the stratosphere in night-time cases. MPL and MiniMPL are the only LiDARs simultaneously approved for NASA MPLNET, US Dept of Energy ARM program, and EUMETNET.TALK TO AN EXPERT
The powerful SigmaMPL software suite is included with every purchase of a MPL or MiniMPL system and allows operation in data acquisition mode or playback mode.
Data acquisition mode:
- Set lidar operation parameters such as laser energy, integration time, or range resolution.
- Generate the raw data profile, r-squared corrected profile, normalized relative backscatter (NRB) profile, housekeeping data, and cloud/aerosol/boundary layer information in real time.
- Get straightforward interpretation of the raw data.
- Retrieve previously stored data files.
- Study a long period of data to determine atmospheric trends.
- Export results for further processing or presentation in other software packages such as Microsoft Excel, MATLAB, or PowerPoint.
Light Detection and Ranging (LiDAR)
- The optical transceiver houses the laser transmitter (operating at a 532 nm wavelength) and the photon counting detection system. The signal is transmitted and received using the same built-in athermal telescope.
- The MPL transmits laser pulses that scatter from particles in the atmosphere.
- It then measures the intensity of backscattered light with single-photon-counting precision, which transforms the signal into atmospheric information in real time.
- When the LCR is operated with zero retardation, the transmitted laser beam is linearly polarized. Backscattered light returning with identical polarization does not pass through the polarizing beam splitter towards the detection optics. In contrast, “depolarized” backscattered light does have some fraction of polarization orthogonal to the incident beam that passes through the polarizing beam splitter towards the detector.
- When the LCR is operated with quarter-wave retardation, the outgoing light is circularly polarized. When circularly polarized light undergoes non-depolarizing scattering, the 180° backscattered light returns circularly polarized but with reversed rotational sense.
|Range resolution||5/15/30/75 m (software programmable)|
|Accumulation time||1 sec - 15 mins|
|Detection range*||Typically to 25 km|
|Laser wavelength||532 nm|
|Laser pulse energy||6 - 8 μJ @ 2500 Hz|
|Eye-safety||ANSI Z136.1 2000, IEC 60825|
|Pump laser diode||Guaranteed to 10,000 hours, user replaceable|
|Size||300 x 350 x 850 mm|
|Operating system||Windows 7/10|
|Data transfer||LAN Ethernet|
|Temperature||Operating +10°C to 35°C|
|Humidity||0 to 80%|
|Supply||110-240 VAC 50-60 Hz|
- GPS (GIS Package)
- All-sky Camera
- Weather Station
The Lifecycle Care Program ensures MPL integrity and performance vital to your research mission for three years or three calls (whichever comes first). When conducting complex and time-intensive laboratory or field measurements, it is critical to avoid downtime and ensure data collection accuracy. The program consists of three 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 and repair estimate to allow you to provide us with the next steps of action.
Multi‐year measurements of cloud base heights at South Pole by lidar
The Micropulse Lidar Network has operated a full-time lidar measurement program at South Pole Station since 2000. Observations from this instrument are an important multi-year record of clouds over the Antarctic plateau.Read More
Status of the NASA Micro Pulse LiDAR Network (MPLNET): Overview of the Network and Future Plans, New Version 3 Data Products and the Polarized MPL
The NASA Micro Pulse Lidar Network (MPLNET) is a global federated network of Micro-Pulse Lidars (MPL) co-located with the NASA Aerosol Robotic Network (AERONET). MPLNET began in 2000, and there are currently 17 long-term sites, numerous field campaigns, and more planned sites on the way.Read More
Aerosol lidar observations of atmospheric mixing in Los Angeles: Climatology and implications for greenhouse gas observations
We report on remotely sensed profiles of vertical aerosol distribution taken over a 2 year period in Pasadena, California. Using an automated analysis system, we estimate daytime mixing layer depth, achieving high confidence in the afternoon maximum on 51% of days with profiles from a Sigma Space Mini Micropulse LiDAR (MiniMPL) and on 36% of days with a Vaisala CL51 ceilometer.Read More