Instrument to measure snow surface conditions has an infra red lamp and a sensor for reflected rays within a housing with a defined opening

摘要

The instrument (2) to measure snow (1) conditions has an infra red lamp (3) and a sensor (6) to measure the reflection from the snow. The lamp and the sensor are in an open hollow housing body (4) with a defined opening (8) aligned at the snow. The sensor signals are evaluated by an integrated electronic unit (10). A diaphragm (22) prevents the infra red rays from the lamp striking the sensor.