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The DC input power for this stage (8 V at 150 mA) should be wellregulated, since the oscillator is voltage-sensitive. The sensitivity of the system can be significantly reduced by noise (interference). At the end of the waveguide assembly, a flange is fastened to the antenna. The antenna focuses the microwave energy into a beam, the characteristics of which are determined by the application. Antennas are specified by beam width or gain. The higher the gain, the longer the range and the narrower the beam. An intrusion alarm protecting a certain domain would require a wide-beam antenna to cover the area, while a traffic control microwave sensor would require a narrow-beam high-gain antenna to focus down the road. Regardless of the antenna selection, when the beam of microwave energy strikes an object, some of the microwave energy is reflected back to the module. The amount of energy will depend on the composition and shape of the target. Metallic surfaces will reflect a great deal, while Styrofoam and plastic will be virtually transparent. A large target area will also reflect more than a small one. The reflected power measured at the receiver decreases by the fourth power of the distance to the target. This relationship must be taken into consideration when choosing the transmitted power, antenna gain, and signal processing circuitry for a specific application. When the reflected energy returns to the transceiver, the mixer diode will combine it with a portion of the transmitted signal. If the target is moving toward or away from the module, the phase relationships of these two signals will change and the signal out of the mixer will be an audio frequency proportional to the speed of the target. This is called the Doppler frequency. This is of primary concern in measuring velocity and direction of motion. If the target is moving across in front of the module, there will not be a Doppler frequency, but there will be sufficient change in the mixer output to allow the signal processing circuitry to detect it as unqualified motion in the field. The signal from the mixer will be in the microvolt to millivolt range so that amplification will be needed to provide a useful level. This amplification should also include 60-Hz and 120-Hz notch filters to eliminate interference from power lines and fluorescent light fixtures, respectively. The remaining bandwidth should be tailored to the application. Besides amplification, a comparator and output circuitry relays are added to suit the application (Fig. 2.97).
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The presence of an object in the microwave field disturbs the radiated field. There may be a Doppler frequency associated with the disturbance. The signal from the mixer to the signal processing circuitry may vary with a large amplitude and long duration so it can be detected. The amplitude gain and the delay period are of specific importance in tailoring the device for particular application, such as
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Typical microwave motion sensor module.
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motion detection. These sensors are primarily used in intrusion alarm applications where it is only necessary to detect the movement rather than derive further information about the intruder. The sensitivity would be set to the minimum necessary level to detect a person-sized object moving in the protected domain in order to prevent pets or other nonhostile moving objects from causing a false alarm. In addition, some response delay would be introduced for the same reason, requiring continuous movement for some short period of time. Other applications include parts counting on conveyer belts; serial object counting in general; mold ejection monitoring, particularly in hostile environments; obstacle avoidance in automated guided vehicle systems; fill indication in tanks; and invisible protection screens. In general, this type of sensor is useful where the objects to be sensed are moving in the field of interest (Fig. 2.98). Other devices that compete for the same applications are ultrasonic, photoelectric, and infrared sensors. In the intrusion alarm manufacturing industry, microwave sensors have the advantages of longer range and insensitivity to certain environmental conditions. Ultrasonic sensors are sensitive to drafts and high-frequency ambient noise caused by bells and steam escaping from radiators. Infrared sensors are sensitive to thermal gradients caused by lights turning on and off. The effectiveness of infrared sensors is severely reduced at high ambient temperatures. However, utilizing dual technologies is recommended to minimize false alarms combining microwave technology with infrared technology, for example. It is necessary for the intruder to be sensed by both technologies before an alarm is given. In other applications, microwave sensors can show advantages over photoelectric sensors in the areas
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