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OPTOELECTRONICS POTENTIOMETERS
Woking, UK - 27, May 2026 - TT Electronics, a global provider of mission-critical power and sensing technology, has been selected to supply Hallogic® Hall-effect sensors for integration into fan assemblies on NASA’s Dragonfly rotorcraft mission. The sensors support a spacecraft subsystem where reliability and consistency are essential across the programme lifecycle.
Hallogic® Hall-effect devices, part of the Optek technology portfolio, are designed for non-contact motion sensing and switching, with variants processed and screened for military and space-grade applications where consistency and reliability are deisgn priorities.
Hallogic® OMH3075S is a high-reliability Hall-effect sensor in the Optek portfolio, designed for non-contact switching and operation across a broad range of supply voltages. The device is specified for operation from -55 °C to +150°C, supporting applications that require reliable switching across wide temperature ranges, and is suitable for military and space applications. For applications requiring enhanced screening, B and S versions are processed and screen to MIL-STD-883, with ESD Class 3B per the same standard.
Dragonfly is a rotorcraft lander mission to Saturn's largest moon, Titan, that is designed to conduct science across multiple locations, sampling surface materials to measure their detailed compositions, and observing geology and meteorology. The Johns Hopkins Applied Physics Laboratory (APL) manages the Dragonfly mission for NASA and is building the rotorcraft, which is scheduled to launch in 2028 and reach Titan in 2034.
"Dragonfly is a mission that demands exceptional reliability and consistency, and we’re proud that the Hallogic OMH3075S has been selected for this application,” said Klaus Zwerschina, VP Components, TT Electronics. “We work closely with customers to de-risk performance-critical designs, supporting programmes that value engineering continuity and a disciplined supply approach from design-in through production, for long service life."
About TT Electronics
TT Electronics is a global provider of engineered electronics for performance-critical applications. The company designs and manufactures solutions that enable a safer, healthier and more sustainable world. Serving key markets including healthcare, aerospace and defence, and industrial, TT Electronics partners with customers to deliver highly reliable solutions where failure is not an option.
Visit www.ttelectronics.com to learn more.
This TT Electronics white paper gives power system architects a practical framework for selecting, calculating, and maintaining optical isolation components designed to last 25 years in demanding grid environments.
Optical Isolation Fundamentals
How galvanic isolation has evolved into a critical performance enabler, including a breakdown of optical coupling mechanics and a comparison of five photodetector types mapped to their industrial applications.
CTR Calculations & Worst-Case Design
How to calculate the Current Transfer Ratio under real operating conditions — with a worked example showing how a nominal 200% CTR device can degrade to 129.2% in the field.
Reliability & LED Aging Mechanics
The Black Formula for predicting long-term CTR degradation, the Five Pillars of Optocoupler Longevity, and how to design for the 2σ worst-case population over a 25-year service life.
Advanced Applications & Compliance
SiC/GaN wide-bandgap driver requirements, integrated smart gate driver comparisons, and a plain-language guide to IEC 60747-5-5, partial discharge testing, and insulation standards.
In the landscape of industrial automation, the debate between maintaining fixed legacy systems and migrating to adaptable optical sensors is not just about technology; it is about operational philosophy. For decades, fixed optical systems—standard logic photocells, basic LED emitters, and fixed-gain optoisolators—have been the backbone of manufacturing. They are reliable, understood, and inexpensive.
However, the shift toward Industry 4.0 has exposed the limitations of these rigid systems. Engineers are now tasked with integrating components that can self-calibrate, communicate status, and adapt to environmental degradation. This article provides a transparent comparison between fixed legacy systems and modern adaptable optical sensors, covering Fibre Optics, Optoisolators, Photologic assemblies, and VCSEL technologies.
A fixed system operates on binary logic or set parameters defined at the hardware level. Once installed, its behaviour is static. For example, a standard infrared emitter paired with a phototransistor will trigger a signal when a light beam is broken. If dust accumulates on the lens, the signal degrades until the system fails. To fix it, a technician must physically clean the sensor or adjust a potentiometer.
Adaptable sensors utilise intelligent circuitry and superior materials (like VCSELs) to adjust to their environment. A programmable Photologic sensor, for instance, might dynamically adjust its hysteresis threshold to account for signal drift caused by temperature changes or debris. These systems prioritise data continuity and predictive maintenance over simple binary switching.
We must acknowledge why legacy systems remain prevalent. They are not without merit.
Lower Upfront BOM Cost – A standard fixed-gain optoisolator or a simple LED-based interrupter is significantly cheaper than a programmable alternative.
Simplicity of Replacement – If a fixed sensor fails, you pull it out and plug in an identical part. There is no firmware to update and no calibration software to run.
Zero Latency – Purely analogue fixed systems often have faster response times than smart sensors that require processing cycles to interpret data.
Legacy systems rely on standard LEDs. While functional, they suffer from beam divergence and lower power efficiency. Adaptable systems utilise Vertical-Cavity Surface-Emitting Lasers (VCSELs). VCSELs offer a narrow, coherent beam that requires less power and provides higher accuracy for position sensing. In adaptable systems, the VCSEL current can be modulated dynamically to maintain constant output power as the component ages.
A fixed system usually employs a discrete photodiode and a separate amplifier circuit. Adaptable Photologic sensors integrate the sensor, amplifier, and logic gate into a single package. The benefit is not just space; it is consistency. These adaptable units often feature internal voltage regulation and temperature compensation that fixed discrete circuits lack.
In high-EMI environments, copper is a liability. While legacy systems try to shield copper, adaptable systems switch to fibre optics. Modern industrial fibre optic links are adaptable because they provide complete electrical isolation and can be routed through hazardous areas where electrical sparks are prohibited. They are immune to the electromagnetic interference that plagues fixed copper legacy systems.
Engineers should consider migrating to adaptable sensors if:
Environmental variation is high – Varying light levels, dust, or temperature swings require sensors that can auto-calibrate.
Downtime is expensive – If stopping a line to wipe a sensor lens costs thousands of pounds, an adaptable sensor that compensates for occlusion is worth the investment.
Precision is critical – If you are moving from simple object detection to precise position sensing, VCSEL-based adaptable systems are required.
Fixed legacy systems are not obsolete, but they are becoming niche. For simple, cost-constrained applications where downtime is manageable, they remain a valid choice. However, for industrial engineers building systems for longevity, reliability, and Industry 4.0 integration, adaptable optical sensors offer a superior return on investment despite the higher upfront cost. By eliminating manual calibration and reducing failure points related to environmental stress, adaptable sensors future-proof manufacturing lines.
Written by TT Electronics
