Sensitive, Long Range
Cloud measurement with advanced signal processing
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Overview

The CS135 LIDAR Ceilometer measures cloud height and vertical visibility for meteorological and aviation applications. Using LIDAR (light detection and ranging) technology, the instrument transmits fast, low-power laser pulses into the atmosphere and detects back-scattered returns from clouds and aerosols above the instrument.

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Benefits and Features

  • Novel split-lens design for high signal-to-noise ratio, maximized detector sensitivity, and extended range
  • Robust, reliable Campbell Scientific electronics
  • Advanced signal processing
  • High performance sensor at a competitive price
  • Integrated heater, blower, and radiation shield
  • Filter to protect detector from direct sunlight

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Technical Description

The CS135 employs a novel split-lens design to increase optical signal-to-noise ratio over other instruments while maintaining Class 1M eye safety by integrating larger optics into a compact package. This optical design provides an alternative to traditional biaxial or common-optics designs. The optical isolation of traditional biaxial systems is maintained to increase detector sensitivity, while the low overlap height of common-optics systems is incorporated to allow measurements at close ranges.

This hybrid approach, along with state-of-the-art electronics measures cloud height and vertical visibility with high accuracy, stability, and repeatability. With a rugged environmental enclosure that protects the instrument from the harshest conditions, the CS135 measures the atmosphere with high stability and repeatability. The enclosure provides sufficient space to house a Campbell Scientific CR1000 datalogger and communications peripherals.

Specifications

Dimensions: 

  • 100.0 x 33.0 x 31.6 cm 
  • (39.4 x 13.0 x 12.4 cm)
  • Weight without cables: 32 kg (71 lb)
  • Weight without cables, outer cowling, and enclosure: 25 kg (55 lb)
  • Temperature Range: -40° to 60°C (-40° to 140°F)
  • Humidity Range: 0 to 100% RH

Instrument Performance

  • Maximum Reporting Range: 
    10 km (32,800 ft)
  • Minimum Reporting Resolution: 
    5 m (15 ft)
  • Hard Target Range Accuracy: 
    ±0.25%, ±4.6 m
  • Reporting Cycle: 2 to 120 s
  • Cloud Layers Reported: Up to four layers
  • Vertical Visibility: Reported when no clouds selected
  • Laser Wavelength: 905 nm
  • Eye Safety: Class 1M

Electrical

  • Power: 110, 115, 230 Vac ±10%, 
    50 to 60 Hz, 470 W maximum
  • Battery: Internal 12 Vdc, 2 Ah battery provides 1 hr measurement without blower/heater, in the event of mains failure.
  • Laser safety compliance: EN60825-1:2001
  • Electrical safety compliance: EN61010-1
  • Interfaces
    Data: RS-232,  RS-485
    Maintenance: USB 2.0 (USB 1.1 compatible)
    Baud Rate: 300 to 115200 bps

Compatibility

Datalogger Considerations

Compatible Dataloggers

CR200(X) Series CR800/CR850 CR1000 CR3000 CR5000 CR7X CR9000X

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