Determines snow depth over long distances
Overview
The SHM 30 snow depth sensor reliably determines snow depths of up to 10 meters within seconds and with millimeter precision. Based on an opto-electronic distance sensor emitting visible eye-safe laser light, the SHM 30 allows probing distances of up to 30 meters to detect the surface level. Even if the measuring process is impaired by precipitation, the SHM 30 reliably finds the snow surface due to its mode of operation. Further evaluation of the transmitted signal strength allows discrimination between snow and grass.
Example Applications
- Weather service
- Aviation safety
- Traffic and road surveillance
- Winter sport areas
- Water & energy related applications
Benefits and Features
- Determines snow depth over long distances using opto-electronic measuring technique
- Mean time between failure (MTBF) greater than 40,000 hours (based on a duty cycle of 30%, 3 measurements/min)
- The built-in heater keeps the laser diode within specification range to ensure a long life
- Compact, weatherproof housing
- Economical laser sensor with RS232 interface and 10 m cable
- Efficient background light suppression
- Discriminates between snow and grass
Images
Technical Description
The SHM 30 snow depth sensor emits modulated visible laser light and determines the distance to an object by comparing phase information. Unwanted measurement results are filtered out using a plausibility method and a measuring time. The SHM 30 allows for operation in automatic and polling mode for the digital output. Additionally, an analog current output is available for snow depth.
Specifications
- Dimensions (l x w x h): 302 x 130 x 234 mm
- Weight: 3.3kg
- Temperature range: -40...+50°C
- Relative humidity: 0...100%
- Heating activity: <0°C programmable
- Measuring parameter: Snow depth 0...10m
- Distance to hard targets: 0.1...30m without far field stray light protection on natural diffuse reflecting surfaces
- Reproducibility: ≤ 0.5mm on natural diffuse reflecting surfaces
- Measuring accuracy: ± 1mm on natural diffuse reflecting surfaces offset corrected sensor 95% statistical spread
- Measuring accuracy snow: ±5mm 95% statistical spread
- Progr. measuring interval: 1...600s
- Measurement time: ≤10s
- Interfaces
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- Data interfaces RS232, analog output
- Interfaces modes RS232: 2.4...38.4kBaud, 8N1 format
- Analogue interface: 3mA und 4...20mA
- Interfaces modes RS2322.4...38.4kBaud, 8N1 format
- Analogue interface3mA und 4...20mA
- Operating modes: Polling, automatic telegram
- Client software: Any terminal program
- Power consumption: 0.5...1W (without heating); 15...24VDC (with heating)
- Safety parameters: Laser classification; Laser Class 2 (IEC825-1/EN 60825)
- Environmental conditions: ISO 10109-11
- Protection type: IP65EMVEN 61326-1