CE370 - LiDAR
CE370 – Long Range Automatic Aerosol LiDAR
The CE370 LiDAR provides continuous & real-time operation with high performance measurements of aerosols and clouds including the vertical distribution with an extended range (up to 25 km).
It features a large aperture (200 mm diameter) for enhanced measurement up to high altitudes while ensuring full compliance with eye safety rules.
A second telescope can be added to extend the measuring range towards very low altitudes (from 50 m).
It can be operated in fixed mode (indoor or outdoor with enclosure) within an observation network, or during punctual campaigns (fixed or even on a mobile vehicle).
Key Benefits
- Aerosol measurements up to 25 km
- Very short blind zone (< 50 m) with an overlap from 5 km
- Real-time “quicklook” visualization
- Automatic extinction and backscattering profiles (with AOD or LR)
- High stability and low maintenance
- Eye-safety compliance with EN-60825/ANSI Z136
- Easy transportation : Outdoor / indoor / mobile operation
Package contents
- 1 long range automatic aerosol LiDAR CE370
- 1 License of LiDAR control software (LiDAR 2) on a USB key
- 1 user manual
Note 1: To be powered by mains.
Note 2: The telescope must be kept between +20°C and +30°C and may be installed within a thermal enclosure (not included).
Related solutions
Source
| Laser type | Green laser: Frequency doubled Nd:YAG |
| Wavelength | 532 nm |
| Pulse energy | 10 µJ (option 20 µJ) |
| Repetition rate | 4.7 kHz |
| Pulse width | < 15 ns |
Optics
| External fiber optics length | 10 m (30 m in option) |
| Main optical head type | Galilean |
| Main optical head aperture diameter | 200 mm |
| Main optical head effective focal length | 900 mm |
| Total beam divergence | Emission: 55 µrad Reception : 55/ µrad (900 µrad for low range ) |
| Beam configuration | Mono-axis. Bi-axis for low range |
| Eye safety | Yes |
Detection
| Detector type | APD QE 55%. |
| Filter bandwidths (3) | 0.2 – OD 12 |
Power supply
| Voltage and power | 100/115/230 V AC , 28 V DC in option, < 100W |
Data acquisition
| Data acquisition mode | Photon counting |
| Continuous acquisition | Yes, automatic |
| Data counting rate | 25 Mc/s |
| Electronic range resolution | 15 m gates |
| Electronic range | From 50 m up to 30 km (2048 gates) |
| Data transfer to PC | USB |
Measurement range **
| Molecular detection range in typical conditions (AOD 0.2) with 10 min averaging | By night time: 25 km By day time: 15 km |
Retrieved products
| PR² / Ln(PR²) data (after instrumental corrections) | Yes |
| Stratification analysis | Yes: aerosols, boundary layers, clouds |
| Extinction & backscatter coefficients | Yes (with additional data : AOD or LiDAR Ratio) |
| Others | Raw data and other connections |
Environmental conditions
| Temperature range | Without thermal enclosure: Control unit = +20°C to +30°C Optical head system = +15°C to +35°C |
| Humidity range | Without thermal enclosure: Control unit = 0 to 90% RH Optical head system = 0 to 100% RH |
General
| System transportability | Yes |
| Optical head dimensions | Diameter 200 mm x 1300 mm |
| Control unit dimensions | L:700 mm x W 200 mm x H 400 mm |
| System weight | 90 kg |
** Measurement range
The detection range of a high altitude layer of particles (aerosols or cloud) strongly depends on its concentration.
The less concentrated the layer, the farther its detection.
Therefore, to define the performance of a LiDAR in terms of measurement range, it is usual to rather refer to the Molecular Detection Range: the distance (in the absence of clouds) up to which the LiDAR is able to measure the tiniest “molecular” signal from an aerosol free atmosphere (with a Signal to Noise Ratio superior to 1). This Molecular Detection Range only depends on measurement conditions (total aerosol loading, averaging time, night/day).
For any given measurement condition, the LiDAR will detect particle layers above the corresponding Molecular Detection Range, the maximal height depending on layer’s concentration.
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