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Questions tagged [optical]

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53 views

Detecting movement of a mechanical ring using optical sensors

I need help deciding on which sensor to use for my current home project. Basically I'm trying to replicate the Numio Control but at much cheaper cost. If it is successful I will publish the result ...
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0answers
27 views

Replace half-duplex electrical connection with light?

The digital pins of two Arduinos are connected for half duplex communication: Now I want to connect the electrical connection with optical communication through a light pipe: Drafts for separate ...
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1answer
22 views

How does one match irradiance to Luminous Intensity in Candela of source?

A light source has an Irradiance of about 1.6 W/m²/nm at wavelenght 385nm and an LED: Peak Wavelength 385nm Viewing Angle 30 ° Luminous Intensity 80 mcd If this light source shines on a ...
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0answers
36 views

Optical Isolation of BNC trigger?

I am wondering if there is a more practical way to provide optical isolation for a BNC trigger. I am currently using the following: https://www.eagleharbortech.com/product-categories/fiber-optic-...
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0answers
45 views

How to Work with a Optical Fiber Ribbon

I got a piece of fiber optical cable that is in the form of a "ribbon cable" (see pictures). I have seen tools and procedures for making connections on a single strand of optical fiber. I would like ...
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0answers
65 views

LED: Calculate Radiant Power[W] and Luminance[cd/m2] from luminous flux[lm]

I'm thinking of using a LED (Color + Cool White) with the following characteristics: Current= 0.350mA; Luminous flux= 13 lm; Efficacy (lumens per Watt) of LED= 12.8 lm/W; Forward voltage of LED = ...
3
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2answers
187 views

Anyone got these optical encoders working? [closed]

I got these Optical Encoders from a local vendor and connected it to my arduino in the following order; (+)----> 5v (-)---> Gnd (01)--->2 (02)--->3 But, it burnt and smoked out as soon as I ...
3
votes
1answer
180 views

SMD LED: How to calculate optical power (in mW) from luminous intensity (in mcd)?

I chose an LED for my application but I need optical power, in mW. In the data sheet, luminous intensity is shown in mcd but I did not find formulas for calculation although there are graphs, etc. ...
1
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2answers
83 views

I've seen many conflicting answers online: For optical storage, does a pit represent a '1' bit or does a land represent a '1' bit?

I've seen many conflicting answers online so: When reading an optical disk, which one of these is true: A 'pit' represents 1 and a 'land' represents 0 or A 'pit' represents 0 and a 'land' ...
1
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0answers
49 views

Water level measurement using Optical Mouse Sensor

I wonder if anyone has hacked an Optical Mouse sensor to measure water level in an overhead water tank? Its possible to read frames data from the sensor and if those frames could be processed with a ...
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0answers
39 views

Negative feedback optical amplifier

Why the feedback network is necessary in this optical amplifier ? How the circuit would work without the feedback photodiode ?
2
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3answers
66 views

Opto switch for detecting translucent polypropylene

I am building a liquid handler (a CNC machine that pipettes small quantities of liquids). The machine switches polypropylene "tips" between pipetting different fluids. Positional accuracy within 0.5mm ...
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1answer
44 views

How come optical data modulation is faster than that of electrical modulation while optical modulation is done by electricity?

why optical data is of high bandwidth that that of electrical copper data bandwidth when we use electrical signal to achieve optical data modulation ?
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2answers
2k views

How does an optical (toslink) to HDMI cable/converter work?

I'm looking at the small Sonos optical audio (toslink) -> HDMI cable in front of me and I don't know how it works (https://www.sonos.com/en/shop/optical-audio-adaptor.html). It has an optical audio ...
1
vote
1answer
149 views

visible light communication data reception

My project is on visible light communication. I use a 555 timer circuit to modulate data with 200 KHz signal using a 3 watt LED. At the receiver I use a photodiode (PS100-6-CER2PIN First Sensor ...
1
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2answers
681 views

Using SFP modules from a microcontroller

I'm interested in having an embedded device send data optically. This is for test and measurement, where having conductive cables is problematic since it will perturb the measurement. The device is ...
0
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2answers
36 views

what is the performance of an OFDM system in one-path channel (Flat response channel),with no multi path propagation?

i work on modelling a OFDM system in a indoor optical wireless channel (LOS channel), since my channel is LOS there is no multi -path propagation , so the delay spread of my channel is much smaller ...
0
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1answer
375 views

How to increase (optical) power of arduino circuit with LED? Increasing current with fixed voltage

We have an LED that when connected to an Arduino board provides an optical power of 22.58 mW. The circuit is just the LED in the digital Pin with the Arduino powered by the computer using a USB cable. ...
0
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3answers
643 views

Circuit design using 2-stage opamp

I am making a medical device that requires to sense very very low intensity blue light. I have attached my circuit design which is a 2-stage amplifier(transimpedance and differential amplifier), but ...
0
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1answer
1k views

How to test an optical sensor board from printer

I have salvaged an optical sensor board from a HP printer just as the one shown c9101-80190-A to use it other hobby projects. The problem is, I cannot be sure whether it's working or not, as I get ...
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1answer
122 views

Can OID technology return an X, Y coordinate?

We are working with a overseas vendor that is using SONIX OID technology. (according to our vendor we are using OID v2) We are using OID technology from them. A smartpen with OID technology is able ...