Ultrasonic Proximity Sensors

Posted by Travis L. Barnes in Ultrasonic
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Ultrasonic Proximity Sensors

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Even liquids can be detected, meaning that capacitive proximity sensors can be used to detect liquid levels in a tank. In a robotics application the robot could detect the point at which it dips its gripper into a cooling bath. Of course, an ordinary temperature sensor might be used in such an application as well. If all else fails, a robotics application may call for an ultrasonic proximity sensor, a device that operates in principle like a submarine sonar detector. A coneshaped beam pulsed at FIGURE 20.96 Shielded inductive sensors (a) can be embedded in metal without affecting performance, while the unshielded variety (b) must be mounted on nonmetallic surfaces only. (From Flueckiger, 1992.) 20.7.2.3 Capacitive Proximity The

ultrasonic.proximity sensor is an example of a reflective sensor that responds to changes in the amount of emitted energy returned to a detector after interaction with the target of interest. Typical systems consist of two transducers (one to 2.2.6 Inductive Proximity Sensors Strictly speaking, the reed switches and photoelectric and ultrasonic sensors discussed so far are all proximity sensors. However, the term "proximity sensor" generally refers to devices based on inductive, capacitive, or magnetic effects, which, with appropriate electronics, can sense the presence of an object. These proximity sensors are usually packaged in one of two. Fig. 2.8. AGASTAT ultrasonic proximity sensors. 1Courtesy of Amerace Corp.l Fig.The

sensor.may be selfcontained and may have a remote head. Ultrasonic proximity sensors and switches. Ultrasonic proximity sensing can be a sensor element or chip, a sensor or transducer, an instrument or meter, a gauge or indicator, a recorder or totalizer, or a controller. The body style of the ultrasonic proximity sensors can be barrel, limit switch, rectangular, slot, or ring. Electrical connectionscan be fixed cable, connector(s), or terminals. Intrinsically safe ultrasonic proximity Sensors act as a range finder for short distances), a beam of light is passed through a prism that refracts the light into its constituent primary colors. Depending on the distance of the object from the sensor, one particular color of light is

reflected.back to the sensor's photodetector. By measuring the energy of the reflected light, the distance can be determined and reported. 8.12.3 Ultrasonic Proximity Sensors In ultrasonic proximity sensors, an ultrasonic emitter emits frequent bursts of Ultrasonic Proximity Sensors All of the preceding proximity sensors relied on target presence to directly change some electrical characteristic or property (i.e., inductance, capacitance) associated with the sense circuitry itself. The ultrasonic proximity sensor is an example of a reflective sensor that responds to changes in the amount of emitted energy returned to a detector after interaction with the target of interest. Typical systems consist of two transducers (one to

transmit.and one to (b) Inductive proximity sensors and switches Inductive proximity sensors are noncontact proximity devices that set up a radio frequency field by using an oscillator and a coil. The presence of an object alters this field, and the (d) Ultrasonic proximity sensors and switches Ultrasonic proximity sensing can use a sensor element or chip, a sensor or transducer, an instrument or meter, a gauge or indicator, a recorder or totalizer, or a controller. The body style of the ultrasonic proximity Ultrasonic proximity sensors detect the presence of objects by measuring the travel time of a highfrequency sound wave that is reflected off an object in the path of the transmitted signal. The sensor has a transducer that

periodically.emits a burst of sound at high frequency (200 kHz or higher) for a short time interval. After the transmission of the burst signal, the sensor switches to receiving mode and records the time when the echo signal was received by the sensor. This process is 2.1.11 Ultrasonic Proximity Sensors Ultrasonic proximity sensors direct ultrasonic sound waves (i.e. high frequency sound waves beyond the audible frequencies) to a target and measure the time taken for the sound waves to return; the further away the object the greater the time taken. Such sensors are used for distances to a target of the order of a few centimeters to a meter. The Omron E4CDS30 ultrasonic proximity sensor has a range of 50–300 mm, the E4CDS80 has

70–800 Proximity.measurement: Proximity sensors, used to determine the presence of nearby objects, were devised to extend the sensing range beyond that offered by directcontact tactile sensors [57–59]. In our study, the main purpose of using these types of sensors is to detect obstacle and avoid collision. Based on specific properties used to initiate a switching action, they can be classified into several types: magnetic, inductive, ultrasonic, microwave, optical, and capacitive. Among these 

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