Banner U-Gage Ultrasonic Sensor Instrukcja Użytkownika Pobierz pdf (Strona 3)

SENSORS

LIGHT GAUGING ULTRASONIC MEASURING ARRAYS RADAR

More information online at bannerengineering.com294

Measuring Light Screens

Banner light screens have a vertical

array of photoelectric emitters and

receivers: The emitters in one

housing, the receivers in another.

An object placed between the

emitter and receiver will block the

emitted light from reaching the

corresponding receivers.

Synchronous Scanning

Identies which of the beams is blocked, by enabling one emitter channel to pulse

light while simultaneously directing its corresponding receiver to look for a signal.

The system records which beam channels are blocked and which are clear, and

then outputs a signal, either analog or discrete.

Sensor Response Time

The time required for an array system to “see” an object varies depending on

which channel is blocked, when the object blocks a particular channel and when

that particular channel is scanned. The result is that the minimum response time

is equal to 1 ms; the maximum response time is equal to twice the scan time. The

scan time, in turn, varies according to array length and scanning mode, and is

specied in the product literature.

• First beam blocked

• Last beam blocked

• Total number of beams blocked

• First beam made

• Last beam made

• Total number of beams made

• Center beam of several

blocked beams

• Number of transitions from blocked

to made

• Highest number of contiguous

beams blocked

Emitter Receiver

Ultrasonic Sensors

Ultrasonic sensors emit a pulse of energy which travels at the speed of sound.

A portion of this energy is reflected off of a target and travels back to the sensor.

The sensor measures the total time required for the energy to reach the target and

return to the sensor and calculates the distance from the sensor to the target.

Temperature Effect

The speed of sound depends on chemical composition, pressure and temperature of

the gas in which it is traveling. In most ultrasonic applications, the composition and

pressure of the gas are relatively xed, while the temperature is not. The speed of

sound increases roughly 1% per 10° F (6° C) temperature increase.

Target Angle

A at target that is perpendicular

to the beam axis will reect

the most sound energy back

to the sensor. As the target

angle increases, the amount of

energy received by the sensor

decreases. For most ultrasonic

sensors, the target angle should

be 10˚ or less.

Air Currents

Air currents due to wind, fans, pneumatic equipment or other sources can deect

or disturb the path of the ultrasonic energy, so a sensor may fail to recognize the

correct location of the target.

Minimum Object Detection

The minimum object detection size is a function of the lens diameter for an

individual channel and the spacing between channels. The minimum object

detection size is dened as the smallest diameter rod that can be detected reliably.

Maximum

Part Speed

The maximum speed of a

passing part is a function of

the part size, the lens

diameter and the maximum

response time of the system.

Measuring Modes

Banner’s measuring light screens can be congured, with a simple Windows

setup program, for several measuring modes for both analog and discrete outputs.

For example, the output can be based on the:

Target Angle

Sensor

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Cold Environment

Warm Environment

Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com

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