{"id":1968,"date":"2026-05-22T06:20:27","date_gmt":"2026-05-22T06:20:27","guid":{"rendered":"https:\/\/photo-detector.com\/?p=1968"},"modified":"2026-05-22T06:20:30","modified_gmt":"2026-05-22T06:20:30","slug":"850nm-nir-led","status":"publish","type":"post","link":"https:\/\/photo-detector.com\/es\/850nm-nir-led\/","title":{"rendered":"C\u00f3mo elegir el LED NIR de 850 nm adecuado para interruptores \u00f3pticos industriales"},"content":{"rendered":"\n

I’ve spent the last twelve years helping factories and automation integrators sort out their optical sensing headaches. More times than I can count, the whole problem came down to the 850nm NIR LED<\/strong> they picked. Not because it was broken, but because it wasn’t the right tool for the job.<\/p>\n\n\n\n

If you’re an engineer trying to keep optical switches triggering cleanly in dusty, hot, or vibration-heavy environments, this article is written for you. No fluffy theory. Just the stuff that actually matters when you have to bet your production line on an infrared emitter for optical switch.<\/p>\n\n\n\n

Why 850nm NIR LED Dominates Industrial Sensing<\/h2>\n\n\n\n

Most people default to 850nm because silicon photodetectors respond extremely well at this wavelength. It’s far enough into the near-infrared that it’s basically invisible to the human eye, yet not so deep that you lose a ton of efficiency.<\/p>\n\n\n\n

From what I’ve seen on factory floors, 850nm NIR LED also punches through moderate dust and oil mist better than visible red LEDs while still giving you fast rise and fall times. That’s critical when your optical switch needs to catch objects moving at 5\u201310 meters per second.<\/p>\n\n\n\n

But here’s the part most datasheets won’t tell you: not all 850nm NIR LEDs are created equal. The difference between a cheap one and a properly engineered high radiance IR diode can mean the difference between 99.9% uptime and constant false triggers.<\/p>\n\n\n\n

The Five Parameters That Actually Matter<\/h2>\n\n\n\n

When I audit a customer’s optical switch design, I only care about five things. Everything else is secondary.<\/p>\n\n\n\n

Radiant Intensity (How Much Punch It Really Has)<\/h3>\n\n\n\n

This is the big one. Look for radiant intensity in mW\/sr<\/strong>, not just total optical power.<\/p>\n\n\n\n

In real industrial applications, I rarely accept anything under 50mW\/sr at 100mA drive current. Our own NIR LED E850-180-201L4<\/a><\/strong> measures 180mW\/sr typical, which gives us breathing room when the lens gets dirty or the distance stretches.<\/p>\n\n\n\n

Quick rule of thumb I use:<\/strong>
Required intensity (mW\/sr) = (Detector sensitivity threshold \u00d7 distance\u00b2) \/ Lens efficiency<\/p>\n\n\n\n

Don’t worry about memorizing the formula. Just remember that every time you double the distance, you need four times the intensity to keep the same signal strength.<\/p>\n\n\n\n

Viewing Angle \u2013 Don’t Guess This One<\/h3>\n\n\n\n

This is where most people go wrong.<\/p>\n\n\n\n