Optički IC senzor

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Razmak između predajne diode i prijemnog tranzistora može biti do 30mm, a uz dobru optiku i smanjenje predotpora IC diode SFH409 sa 180 na 100R, moguć je razmak i do 70mm. Za extra povećanje dometa može se koristiti dodatno pojačalo AC signala (npr sa pojačanjem 10, ). Razlog tome je što je potrebna relativno velika minimalna amplituda signala (50mVpp) na ulazu u LM567, a koja je daleko iznad razine šuma. Na donjoj shemi je je primjer sa dodatnim AC pojačalom. Maksimalni razmak između predajnika i prijemnika je povećan do 25cm (bez specijalne optike). Treba paziti da je AC pojačalo u blizini IC detektora radi smanjenja smetnji.</div> <bR> <div> <IMG SRC="54758030.gif" border=0 width="600" height="259" ALT="IC fotoćelija" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-2650537455752702" crossorigin="anonymous"></script>  <ins class="adsbygoogle" style="display:block" data-ad-client="ca-pub-2650537455752702" data-ad-slot="7117608876" data-ad-format="auto" data-full-width-responsive="true"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> <bR> <bR> <div>      Isto tako, umjesto infracrvene diode može se koristiti i visokoefikasna uskokutna crvena LED dioda (1000mcd). Bitno je jeftinija od IC diode, a djeluje efektnije i može se odmah vidjeti da je aktivna. Sklop je provjeren i radi dobro na dnevnom svijetlu (ne na osunčanom mjestu). Prijemnik izdržava i direktno osvjetljenje rasvjete bez ometanja u radu. Odziv detektora je brz te je moguće prepoznavanje prekida i uspostave optičke vidljivosti u vremenu kraćem od 500us (potrebno je prilagoditi izlazni RC filtar da bi takav signal prošao dalje).</div> <bR> <div>      Ako je izlaz namjenjen samo signalizaciji, tada treperenje u rubnom području i nije toliko važno. Međutim, ako želite pouzdan signal, tada preporučujemo upotrebu filtra i schmitt triger sklopa (npr. 74HC14) na izlazu LM567.</div> <bR> <div>      Opcija korištenja razdvojenih predajnika i prijemnika je korištenje u integriranih u istom kućištu. Na primjer, može se koristiti refleksni senzor CNY70. On može biti osvjetljen i na nemoduliranom IC snopu bi lako mogao lažno pokazati izlaz. Primjenom ovog sklopa neće se nikada dogoditi da senzor lažno reagira.</div> <bR> </td> </tr></table></body>