Vaisala Oyj

Viasala Oyj

Jukka Kallio

Klaus Heyn

Jan Lönnqvist

An example forward scatter sensor comprises: a transmitter arranged to emit a single light sheet; a receiver to observe light scattered from particles that fall through a measurement volume; and a control entity comprising an analyzer arranged to record a measurement signal descriptive of intensity of light captured by the receiver as a function of time and to carry out a precipitation analysis on basis of a time segment of the measurement signal, the precipitation analysis comprising: identifying, in said time segment, one or more double peaks that each represent a respective droplet and comprise a first peak that represents light refracted from a bottom of the respective droplet upon entry to the measurement volume and a second peak that represents light reflected from a top of the respective droplet upon exit from the measurement volume; and deriving one or more precipitation parameters and one or more precipitation indications.

Forward scatter sensor

An atmospheric cloud height, humidity profile, or temperature measuring method and arrangement are provided. In the method, pulsed laser signals () are transmitted through transmission optics () to the atmosphere and the signal () reflected or scattered back from there is detected. An interference filter () is used in the optics, in order to stabilize the transmitted optical power to the center wavelength of the interference filter ().

Atmospheric humidity or temperature or cloud height measuring method and apparatus

A lidar, which includes a transmitter and a receiver, as well as an optical system, which is arranged to direct at least part of the light sent by the transmitter as a transmitter beam progressing towards an object and to define the receiver beam to the receiver, at least part of the light arriving from the zone of which is focussed on the receiver. The optical system of the lidar is implemented in such a way that the beams immediately in front of the lidar are located essentially outside of each and one of the beams at least partially surrounds the other beam. The optical system includes an integrated optical, which has a first area for forming the transmitter beam, and a second area for forming the receiver beam.

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Helsinki, Finland

Jukka Kallio