500.00 Indian Rupee ₹ · how a motion sensor detect movement
Published date: November 24, 2025 3:39 pm
Location: E-154, Sector 63, Noida, Uttar Pradesh – 201301, India, Delhi, noida, noida, india
1. Passive Infrared (PIR) Motion Sensors
Working Principle:
PIR sensors detect infrared radiation (IR) emitted by the human body (around 9–10 µm wavelength).
They use pyroelectric elements positioned behind a Fresnel lens, dividing the detection area into multiple zones.
When a person moves across these zones, the change in infrared energy produces a small voltage signal — which triggers the sensor.
Technical Highlights:
Detection range: up to 8–10 meters
Detection angle: 120°–180° wide
Trigger time: <1 second
Highly energy-efficient and stable indoors
Ideal for washrooms, cabins, meeting rooms, and corridors
Advantages:
Low power consumption
Simple and cost-effective installation
Immune to background lighting variations
Reliable performance in controlled spaces
Limitations:
Cannot detect stationary humans
Requires visible body movement for activation
2. Microwave (Doppler Radar) Motion Sensors
Working Principle:
Microwave sensors emit electromagnetic waves (usually at 5.8 GHz) and analyze the reflected signals.
When a person or object moves, the reflected frequency shifts — known as the Doppler Effect.
This shift is detected and processed as movement, even through thin, non-metallic materials like glass or plastic.
Technical Highlights:
Frequency: 5.8 GHz (ISM band)
Detection range: up to 12–15 meters (adjustable sensitivity)
Coverage: 360° spherical detection for ceiling-mounted models
Detection speed: 0.3–3 m/s (micro-motion sensitivity)
Operating voltage: 220–240V AC / 12V DC
Ideal for corridors, staircases, parking areas, warehouses, and open offices
Advantages:
Works efficiently in dark, smoky, or low-visibility conditions
Detects movement through thin partitions or glass
Provides wide, uniform coverage
Ideal for large, open, and dynamic areas
Limitations:
May detect motion beyond walls if sensitivity is too high
Requires calibration for precise detection
3. Daylight Harvesting Motion Sensors (TRUEiSENSE Smart Series)
TRUEiSENSE Advantage:
These sensors combine motion detection (via PIR or Microwave) with ambient light sensing to automatically regulate artificial lighting based on natural daylight levels.
How It Works:
Built-in LUX sensor measures the surrounding light intensity.
When natural light is sufficient, the sensor dims or switches off artificial lighting.
When light levels drop, the sensor activates lighting automatically, ensuring consistent illumination.
Simultaneously detects human presence or motion, ensuring lights operate only when needed.
Benefits:
Enables maximum energy savings through intelligent brightness control.
Maintains optimal lighting comfort for occupants.
Reduces manual switch dependency and energy wastage.
Ideal for office workstations, classrooms, lobbies, and retail spaces.
Integrates seamlessly with IoT-based lighting control systems.
Technical Highlights:
Detection technology: PIR / Microwave + LUX sensing
Adjustable LUX threshold for customization
Works with 0–10V, DALI, or relay output control
Designed for ceiling or wall mounting
Delivers up to 60–80% lighting energy savings
???? Applications of TRUEiSENSE Motion Sensors
Smart lighting control in offices, corridors, classrooms, and restrooms.
Daylight-based automation for energy-efficient lighting design.
HVAC and ventilation management based on occupancy.
Contactless operation for hygiene-critical zones.
Security and occupancy analytics for smart buildings.
???? In Summary
TRUEiSENSE motion sensors use Microwave (Doppler Radar) and PIR (Infrared) technologies, enhanced with Daylight Harvesting intelligence, to detect human movement and ambient brightness accurately.
They deliver the perfect blend of comfort, efficiency, and automation, making them essential for smart offices, sustainable buildings, and intelligent energy management systems.
Visit: https://www.motionsensorledlight.com
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