Luminance detector outside tunnel

Luminance detector outside tunnel Product Overview:

Luminance detector outside tunnel measures the level of brightness or luminance created by natural light at the tunnel entrance/exit.Highway tunnels are special sections of highways. As a unique tubular structure, they have a narrow spatial environment, significant light variations, and limited visibility. Unlike the bright and spacious roads outside the tunnel, the process of vehicles entering and passing through a tunnel involves transitioning from bright to dark and then back to bright. This transition requires an adaptation period, during which drivers may have difficulty identifying road targets or objects inside the tunnel, leading to visual and psychological challenges and making driving unsafe. The purpose of tunnel lighting is to create a good visual environment inside the tunnel, ensuring that vehicles traveling at the design speed can safely approach, enter, and pass through the tunnel during both daytime and nighttime.

Luminance detector outside tunnel is a highly efficient lighting control system designed to address the visual adaptation problems caused by the difference in brightness between the inside and outside of tunnels. To meet the requirements of highway tunnel lighting control in China, our company has developed tunnel interior illuminance detectors and exterior brightness detectors.Its overall design fully meets the requirements of harsh outdoor working environments, offering high reliability and low maintenance.Utilizing the latest microprocessor technology, it operates completely digitally and is easy to install and debug. By accurately measuring the brightness at the tunnel entrance and automatically adjusting the internal lighting, Luminance detector outside tunnel aims to improve the scientific accuracy and energy efficiency of tunnel lighting, ensuring driving safety and energy savings, while also complying with the requirements of the "Design Specifications for Ventilation and Lighting of Highway Tunnels."

Luminance detector outside tunnel Application Scenarios:

1. Monitoring and Regulation:  Used in conjunction with tunnel interior illuminance detectors, the exterior detector monitors real-time changes in external light intensity. This allows for the adjustment of interior tunnel lighting intensity, ensuring a smooth transition between interior and exterior light levels, reducing visual impact on drivers entering and exiting the tunnel, and improving driving safety.

2. Energy Saving Optimization:  Dynamically adjusts the tunnel's lighting power based on the intensity of external natural light, avoiding over-illumination during the day or insufficient lighting at night. This ensures precise allocation of lighting resources, reduces tunnel operating costs, and achieves energy savings.

3. Safety Warning: When extreme weather conditions cause a sudden drop in external brightness or other abnormal situations are detected, an emergency lighting plan can be activated in advance.Variable message signs and other devices can then be used to warn drivers to slow down, ensuring driving safety.

Luminance detector outside tunnel Product Features:

1.Excellent linear relationship between brightness and photocurrent, with timely response to light changes.

2.Uses a specially designed high-efficiency filter corrected according to the CIE standard human eye visual spectrum curve, conforming to human visual characteristics.

3.The device has a built-in heating element and cooling fan to maintain optimal operating temperature, minimizing the impact of temperature on accuracy.

4.Features automatic gain control technology to improve accuracy in both low-light and high-light environments.

5.The device includes status display, fault alarm, and data storage functions for easy debugging and maintenance.

6.Wide measurement range with a robust and durable optical probe.

7.Multiple output options for convenient data acquisition.

8.Low power consumption design ensures continuous operation while saving energy.

9.Specifically designed for the harsh environmental conditions of tunnels, guaranteeing long-term stable operation.

10.Equipped with lightning protection measures; the communication and power interfaces have lightning protection designs, significantly reducing the damage caused by lightning strikes.

Luminance detector outside tunnel Technical Specifications:

Measurement Range: 0–10000 cd/m²

Measurement Angle: Vertical ≥20º, Horizontal ≥20º

Measurement Accuracy: ±0.1 cd/m²

Communication Interface:

1 x RS485 digital output interface;

1 x 4–20mA analog output interface;

1 x Relay switch alarm output interface.

Power Consumption: Rated 5W, Maximum 20W (heating)

Load Impedance: ≤500Ω

Power Supply Voltage: 90V-305VAC (47-63Hz)

Operating Temperature: -50℃～+85℃

Operating Humidity: 0–100%RH

Protection Rating: IP68

Operating Life: ≥50000 hours

Installation Method: Pole mounting