Product Overview
The OHTS1120 Road Surface Condition Sensor is a non-contact road surface condition monitoring device based on spectral analysis technology. Employing active remote sensing detection principles, the sensor emits monochromatic beams at specific wavelengths and receives reflected spectra from the road surface to achieve real-time analysis of road surface materials and status.
The sensor integrates a laser source and optical receiving system. The emitted light is focused by lenses and projected onto the road surface. By measuring the intensity and spectral characteristic differences of the reflected light, the internal processing unit calculates and outputs road surface condition parameters. The device incorporates a lens heating module to prevent optical window frosting in low-temperature environments, ensuring all-weather continuous monitoring capability.
Features
- Multi-parameter Fusion Detection: Simultaneously measures road surface conditions (dry/damp/wet/puddled/icy/snowy), water film thickness, ice layer thickness, snow depth, and road surface temperature
- Non-contact Remote Sensing Detection: Utilizes optical remote sensing technology without damaging road structures; adjustable measuring distance from 2m to 10m
- Anti-interference Optical Design: Laser source paired with narrow-band filters effectively suppresses ambient stray light interference
- Environmental Adaptability Design: Device enclosure features anti-corrosion treatment with protection rating suitable for long-term outdoor operation; built-in 13W heating module prevents lens frosting in winter
- Electrical Protection Functions: DC power input equipped with reverse polarity protection and self-recovering fuse
- Standard Industrial Interface: RS485 communication interface supporting ModBus-RTU protocol with configurable baud rates from 1200 bit/s to 115200 bit/s
Applications
The OHTS1120 is designed for comprehensive road condition monitoring across various infrastructure scenarios:
- Highway road condition monitoring and early warning systems
- Urban road meteorological environment monitoring networks
- Airport runway surface condition real-time monitoring
- Bridge and tunnel entrance road safety monitoring
- Traffic meteorological station road parameter acquisition
- Winter road de-icing and snow removal operation guidance
- Intelligent Transportation Systems (ITS) road condition perception nodes
- Road maintenance management decision support systems
Technical Specifications
| Parameter | Specification |
|---|---|
| Supply Voltage | 11V DC ~ 28V DC |
| Static Power Consumption | 1.5W |
| Heating Power Consumption | 13W |
| Communication Interface | RS485 |
| Communication Protocol | ModBus-RTU |
| Baud Rate | 1200/2400/4800/9600/19200/38400/57600/115200 bit/s (default: 4800 bit/s) |
| Data Format | 8 data bits, no parity, 1 stop bit |
| Device Address | 1~254 (default: 1) |
| Measuring Distance | 2m ~ 10m |
| Measuring Spot Diameter | 25cm |
| Installation Angle Range | 0° ~ 60° (recommended: 10° ~ 40°) |
| Road Condition Recognition | Dry, Damp, Wet, Puddled, Icy, Snowy |
| Water Film Thickness Range | 0.00mm ~ 2.00mm |
| Ice Thickness Range | 0.00mm ~ 2.00mm (customizable) |
| Snow Depth Range | 50mm ~ 2500mm (optional function) |
| Road Surface Temperature Range | -30℃ ~ 60℃ |
| Slipperiness Index | 0.00 ~ 1.00 (0=dangerous, 1=dry) |
| Data Update Interval | 20s |
| Operating Temperature Range | -40℃ ~ 60℃ |
| Operating Relative Humidity | ≤95%RH (at 30℃) |
Physical Specifications
| Parameter | Specification |
|---|---|
| Mounting Method | Cross arm + clamp mounting, compatible with φ75mm pole |
| Mounting Accessories | Cross arm×1, Clamp×1, M5×55 Hexagon head screws×3, M5 Nuts×3, M8×70 Hexagon head screws×3, M8 Nuts×3 |
FAQ
Q: What is the measurement principle of this sensor?
A: The sensor uses active remote sensing detection based on spectral analysis technology. It emits monochromatic beams at specific wavelengths and analyzes reflected spectra from the road surface to determine material composition and status.
Q: What is the recommended installation angle and measuring distance?
A: The recommended installation angle range is 10° to 40° with a measuring distance of 2m to 10m. The installation angle can be monitored through configuration software to ensure the measuring spot falls on the target road surface area.
Q: Is calibration required after installation?
A: Yes, road surface condition calibration must be performed after initial installation or position changes. Ensure the road surface is dry and unobstructed during the 5-minute calibration process. If snow depth measurement is enabled, additional zero-point calibration is required.
Q: What communication protocol does the sensor support?
A: The sensor supports RS485 communication interface with ModBus-RTU protocol. Default baud rate is 4800 bit/s with configurable range from 1200 bit/s to 115200 bit/s. Data format is 8 data bits, no parity, and 1 stop bit.
Q: How does the sensor prevent lens frosting in winter?
A: The device incorporates a 13W heating module that prevents optical window frosting in low-temperature environments, ensuring all-weather continuous monitoring capability even in severe winter conditions.