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English to Thai: vona_trial test for os_ID-XX General field: Tech/Engineering Detailed field: Electronics / Elect Eng
Source text - English PHOTOELECTRIC SENSORS
GLOSSARY
Term
Description
Beam envelope
Beam axis
Beam envelope:
Beam spread
Beam axis:
The center axis of light beam
Sensor
Sensing axis
The center axis between the emitted beam axis and the received beam axis.
For the thru-beam type sensor, it is identical to the beam axis.
Received beam axis
Emitted beam axis
Sensing axis
Sensing range
Distance to convergent point
Thru-beam type
The distance which can be set between the emitter and the receiver under the stable sensing condition.
(The abbreviation “0 ~” is set for values starting from 0.)
Sensing range
Emitter
Receiver
Retroreflective type
The distance which can be set between the sensor and the reflector under the stable sensing condition.
Reflector
Reflective type
The distance which can be set between the sensor and the standard sensing object (normally, white non-glossy
paper) under the stable sensing condition.
Standard sensing object
Distance to convergent point:
With the convergent reflective type sensor or the mark sensor, sensitivity is not proportional to the setting distance and the maximum sensitivity point is at an intermediate position.
This point at which the sensitivity is maximum is called the convergent point and is specified along with the sensing range.
Sensing area
Sensitivity
Convergent reflective type
Diffuse reflective type
Convergent point
Setting distance
The standard sensing object for determining the basic specifications of reflective type sensors.
Normally, it is white non-glossy paper, but some particular sensors use other objects to suit the application. (e.g., glass)
Minimum sensing object
The minimum object size that the sensor can detect under the specified conditions.
In the thrubeam type and the retroreflective type, the size of an opaque object (completely beam interrupted object) is specified.
In the diffuse reflective type, the diameter of a gold wire or a copper wire is specified.
(øxxx mm øxxx in value is expressed)
øa mm
øa in
Hysteresis
For a reflective sensor, the hysteresis is the difference between the operation distance, when the output first results in light-ON with the standard sensing object approaching along the sensing axis, and the resumption distance, when the output first results in light-OFF with the standard sensing object receding.
It is displayed as a percentage (%) versus the operation distance.
The movement distance is displayed as a percentage (%).
Hysteresis prevents output instability caused by vibrations in the sensing object.
Operation distance
Resumption distance
Repeatability
The difference in the operating position when operation is repeated under constant conditions.
Approach perpendicular to sensing axis
Approach along sensing axis
Response time
The time lag between a change in the sensing state and the turning ON / OFF of the sensing output.
Sensing condition
Output operation
Beam-received
Beam-interrupted
ON
OFF
t:
Response time
Ambient illuminance
The maximum ambient light intensity that does not cause sensor malfunction.
It is expressed as the permissible light intensity at the light receiving face.
The illuminance is stipulated to be an incandescent lamp.
* Sunlight has two or three times the illuminance of an incandescent lamp.
Before use, refer to “Influence of extraneous light” (p.1459) described in “PRECAUTIONS FOR PROPER USE”.
Illuminance meter
Light source (Incandescent lamp)
Pressure Sensors
Flow Sensors
Inductive Proximity Sensors
Displacement Sensors
Electrostatic Sensors
Static Removers
About Laser Beam
General Precautions
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