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- Microwave detection is a newer and more advanced occupancy sensor than the PIR– it works by emitting high-frequency electromagnetic waves and then receiving their echo. The sensor detects the change in echo from the slightest movement in the detection zone which commands a microprocessor to switch the light on.
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There are two main types of motion detection sensors available, microwave and PIR (Passive Infrared) and we’re here to take a quick look at the pros and cons of each. pir These sensors detect heat.
Microwave Sensors. Instead of detecting heat signatures, a microwave sensor sends out invisible microwaves throughout their detection wave, and measures how long it takes these waves to return to the sensor. This is a process known as Echo Time.
Microwave detection is a newer and more advanced occupancy sensor than the PIR– it works by emitting high-frequency electromagnetic waves and then receiving their echo. The sensor detects the change in echo from the slightest movement in the detection zone which commands a microprocessor to switch the light on.
In lighting applications, microwave sensors are a type of motion detector that switches a light on when the sensor detects movements. These sensors can react within less than 1/5 of a second. And more advanced models can even detect whether a person is moving towards or away from the sensor, or moving randomly.
- Introduction
- How Does A Passive Infrared Sensor (PIR) Work?
- How Does A Micro-Wave Sensor (MW) Work?
- What Is The Doppler Effect?
- Passive Infrared (PIR) V Microwave (MW) For Occupancy Sensing. Which Is Best?
Passive infrared (PIR) and microwave (MW) sensors are both widely used in lighting control. They both have the ability to detect moving objects, such as human bodies, but they work in quite different ways to each other. As a result, they have different advantages and drawbacks depending on their application. Please note that neither a PIR nor a MW ...
A PIR is a passive device. It detects the movement of an infrared radiation source within its range and field of view. Infrared (IR) radiation is emitted by all warm or hot bodies, including birds, mammals and any heat source such as an engine or motor that has been running recently. The warmer they are the more IR they emit. Provided that there is...
A micro-wave sensor is an active device. It emits very low-level pulses of electro-magnetic radiation which hit, and bounce back from objects within its range. The sensor receives and, using the Doppler effect, analyses the incoming radiation to determine if there are any moving objects in the field of view.
Most of us experience the Doppler effect every day with respect to sounds we hear. The Doppler principle is that the apparent frequency of a wave (such as sound) depends on the speed of the source (which is making the sound) relative to the speed of the receiver (which is hearing the sound). The Doppler principle can be applied to any wave, not jus...
Both technologies have their strengths and weaknesses and are therefore better suited to different applications in lighting control. 1. High and low ambient temperatures. To function, a PIR requires a temperature differential between the moving object and the background. Therefore, bearing in mind that the human body temperature is 37ºC, the abilit...
Dependent on your needs and requirements, there are several varieties of PIR sensors based on different factors, functions and adjustments. However, detection range is usually 180°, making it ideal for use in open gardens, driveways or entranceways.
Feb 13, 2018 · MW sensor sends out microwaves and analyzes the echo that comes back to the device. If the movement changes the echo pattern the sensor will respond and switch the light on. Microwave sensors have a consistent capability of detecting movement over all temperatures.
