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Retroreflective & Polarized Retroreflective

Tri-Tronics® offers both Retroreflective models and Polarized Retroreflective models.Retroreflective

Retroreflective - Very narrow beam optics designed to sense reflectors or refelective materials at long range. Designed for Beam Break sensing.

Polarized Retroreflective - Polarized to reduce response to "hot spot" glare from shiny surface of detected object. Used with red or blue light source.

The Retroreflective sensor contains both the light source and receiving device in one housing. A unique dual lens system or bifurcated fiber optic light guide establishes the transmitted light beam path and the returned light beam path on the same axis. When a retroreflective sensor or fiber is pointed or aimed at a reflector, the light beam is reflected back to the receiving lens or fiber. Sensor alignment with a prismatic reflector can be skewed by 10 to 15 degrees and, still a strong light beam will return to the receiving lens on exactly the same axis as the original transmitted light beam.

ReflectorTo detect presence or absence of objects, the light beam path is directed across the detection path so that passing opaque objects interrupt the light beam. When the light beam is broken or when the intensity of the received light beam is reduced below a threshold level, the sensor responds by switching its output.

When sensing small parts, the recommended choice is opposed mode sensing using fiber optic light guides. The retroreflective sensor is generally low in cost and easy to install. However, care must be taken to ensure that shiny objects passing near the sensor do not reflect a light beam off the surface of the object strong enough to accidentally switch the sensor’s output. This undesirable characteristic of the retroreflective sensor is referred to as proxing. To prevent proxing, the sensor’s light beam can be aligned on an angle of incidence that reflects the light beam away from the receiving lens. Another way to reduce proxing is to polarize the light beam. Polarized light helps to ensure that only the light beam reflected off the prismatic reflector reaches the sensor’s receiver. While reducing the response to light reflected off the surface of the sensed object, polarizing reduces sensing range.

Detection of Large Objects
Detection of Large Objects

Detection of reflective tape moving at high rapidity
Detection of reflective tape
at high rapidity

Detection of objects moving at high velocity
Detection of objects moving
at high velocity


High performance retroreflective sensor for sensing a transparent glass or plastic product
High performance retroreflective sensor
for sensing a transparent
glass or plastic product

Fiber optic retroreflective detection of moving objects
Fiber optic retroreflective detection
of moving objects


Beam Break detection of objects at sensing sites where mounting space is limited
Beam Break detection of objects
at sensing sites where
mounting space is limited

Click Here to Purchase a Retroreflective Sensor!

Click Here to Purchase a Polarized Retroreflective Sensor!

To learn more about the sensor families we offer in this product class, please see below.

15 Item(s)

  1. RetroSmart


    Retroreflective Clear Object Sensor
    Detects clear/translucent containers and shiny objects from the leading edge to the trailing edge without false signals.

  2. Smarteye Classic


    High Resolution, High Speed Sensor
    Features our unique Contrast indicator that provides for precision set-up and performance verification no matter how minute the light-to-dark contrast. Multiple lens configuration modes including fiber optic mode.

  3. EZ-EYE


    Miniature Push Button Sensor
    Versatile for a wide range of automated machine control applications and simple to set-up using our unique one-touch AUTOSET routine. EZ to align and EZ to adjust.

  4. EZ-Pro


    Automatic Self-Adjusting General Purpose Sensor
    High performance, automatic adjusting photoelectric sensor that can be set-up and configured by a single push of a button. Multiple lens configuration modes including fiber optic mode.



    High Performance Sensor with "Enhanced Dynamic Range"
    High-resolution photoelectric sensor capable of performing sensing tasks most other sensors can't accomplish. It provides extended operating ranges, enhanced background suppression and the elimination of saturation problems. Multiple lens configuration modes including fiber optic mode.



    Miniature High Performance Sensor
    High performance photoelectric sensor in a miniature size that you can use anywhere for any task... including your toughest industrial sensing applications.



    Miniature Sensor
    Very economical. Snout mountable in tight locations. Rugged and waterproof for use in hostile environments. Immune to indirect ambient light and strobes.



    Miniature Sensor
    Provides the same features and benefits of large, expensive sensors... at an affordable price. Interchangeable solid "optical grade" high impact lenses available for many sensing applications.

  9. Opti-Eye


    Miniature DIN Rail Mountable Sensor
    Rugged, cost effective, miniature, easy to use, versatile, and waterproof. High reliability for those tough general purpose industrial sensing tasks.



    General Purpose Self-Adjusting Sensor
    An automatic event-driven, self-adjusting photoelectric sensor that compensates for deteriorating changes during operation. Set-up and configuration at the push of a single button. Configurable lens or fiber-optic modes.

  11. SMARTEYE SmartDot Laser Sensor


    Precision Laser Sensor
    Detects small parts detection at long ranges. Used to detect such things as a tab on a battery, a misaligned or missing bottle cap, or a cross-threaded can lid.

  12. Tiny-Eye


    Small and Economical
    Fills the need for a standard "low cost" miniature DC-powered sensor with the flexibility to perform a multitude of industrial sensing tasks.

  13. U.S. Eye

    U.S. EYE

    AC/DC Sensor with Timer, Relay, or Triac Output
    Self-contained, easy-to-use sensors available in a wide variety of sensing models (thru-beam, retroreflective, proximity and fiber optic) to fit virtually any application.

  14. XPC


    General Purpose Sensor with Data Port
    General purpose sensor used for a wide range of applications. Great for applications where physical contact of the sensor is either restricted, undesirable, or delays production line throughput. RS-232 single sensor or RS-485 multi-drop data port.

  15. X-PRO XP10

    X-PRO XP10

    X-tremely High-Speed Dual-Function Sensor
    The highest speed (10µs) dual-function sensor in the world. One mode for precision registration mark sensor with 5µs repeat­ability and the other mode for standard photoelectric sensing of any high speed application.

15 Item(s)