Timeline for IR Sensor Replacement
Current License: CC BY-SA 4.0
14 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Nov 28, 2019 at 7:23 | vote | accept | lucenzo97 | ||
| Jul 4, 2019 at 18:44 | comment | added | lucenzo97 | @DKNguyen I also did an experiment on illuminating visible light onto SFH415, which has IR filter and TSKS5400S, which doesn't have such filter (transparent - blue housing). SFH415 shows slightly better results in rejecting visible (white) light than TSKS5400S. So, I guess that IR filter eliminates some of visible light, but not all. | |
| Jul 4, 2019 at 18:44 | comment | added | DKNguyen | @Keno It is useful for both the phototransistor AND the LED to have a field of view only as wide as is necessary. It sees less of what you don't want to see and sees more of what you do want to see. It increases the signal-to-noise ratio in a sense by allowing the signal of interest to dominate more over the background noise. | |
| Jul 4, 2019 at 18:41 | comment | added | lucenzo97 | @DKNguyen Why narrower FOV (Field of View, I think)? To eliminate as much ambiental light as possible and receive IR emitter's beam which is focused (that is why wide FOV phototransistor is not needed in this case)? | |
| Jul 4, 2019 at 16:36 | comment | added | DKNguyen | I would go for narrower FOV phototransistors and LEDs first. Flashing it (ie modulating) lets you pulse the LED at higher currents without frying it | |
| Jul 4, 2019 at 16:24 | comment | added | lucenzo97 | @DKNguyen I think that driving IR LED even more is the best solution that I can think of right now. In current circuit design, I am sinking 100 mA current through it - that is its max. Do you think more powerful IR LED would result in higher voltage readings from IR sensor? Something like SFH4715A - 1A max and much higher radiant intensity. What do you think? | |
| Jul 4, 2019 at 15:50 | comment | added | DKNguyen | that is unusual. the opaque black is the visible filter. My sfh313 doesnt give a zero reading under ambient but i never tested response against visible light sources. but the illuminated reading is much higher than the nonzero ambient reading. maybe just drive your LED more? your incandescent does put out near IR though. i work under fluorescents | |
| Jul 4, 2019 at 15:46 | comment | added | lucenzo97 | @DKNguyen Just did. In response to your other comment, check SFH415. It consists of black colored plastic, which is most probably IR filter. Currently I am using it as emitter and receiver (sensor connected to comparator). With that filter, it acts the same way as TSKS5400S; generates voltage up to 1V if greatly illuminated with light bulb. So, I guess that filter doesn't help much. Any other ideas? | |
| Jul 4, 2019 at 15:41 | history | edited | lucenzo97 | CC BY-SA 4.0 |
Added information about parts
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| Jul 4, 2019 at 0:20 | comment | added | jsotola | research TV remote controlls | |
| Jul 3, 2019 at 22:03 | comment | added | DKNguyen | UV won't help you. UV devices are very expensive and one of the reason is that UV is absorbed by almost everything that is cheap (plastic, glasses). | |
| Jul 3, 2019 at 21:35 | comment | added | DKNguyen | You bothered drawing a schematic, so why wouldn't you giving us the part numbers? | |
| Jul 3, 2019 at 21:11 | answer | added | D.A.S. | timeline score: 1 | |
| Jul 3, 2019 at 20:59 | history | asked | lucenzo97 | CC BY-SA 4.0 |