Questions tagged [optical]

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Using QSFP28 Module at Lower Lane Rate

I have an application that requires optical transmission of 4x16 Gbps SERDES lanes over fiber. A QSFP28 module for 100G ethernet seems like a great commercial solution--it can take the four lanes and ...
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2answers
46 views

How best to connect two optical limit switches to share one I/O pin

I'm trying to build a CNC laser engraver using a scrap industrial CNC gantry as a donor. The system already has optical limit switches for the max & min on each axis. I can't use the current ...
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0answers
13 views

Q-value in APD photodetector

I try to calculate the Q value of APD photodetector with these parameters: $$R \hspace{0.1in} (response) = 1$$ $$M \hspace{0.1in} (magnification) = 10$$ $$k \hspace{0.1in} (ionization \hspace{0.1in} ...
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2answers
58 views

Selection of wavelength for optical reflective sensing

Most of the reflective sensors in the market use either red or near IR wavelength and have a very short range (in the range of mm). Given the reflectance of the Si at different wavelengths and ...
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0answers
31 views

Transmitting .mp4,.bin,.txt files with on off keying OOK (optical communication)

How do you implement OOK to transmit mp4 files etc. For instance i have LED and a video file to transmit. How do you take the video convert it to binary, send it via the LED recieve it via the ...
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4answers
100 views

Precision Current Sink for LED Modulation

I one of my first designs, I am attempting to simulate a high precision optical transmitter using an LED by varying the brightness in linearly with the incoming signal. The input signal is BFSK, ...
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1answer
68 views

Optical displacement sensor noise and current to voltage conversion

I'm currently involved in a project with the aim of measuring the tremor of mice limbs (displacements of about 100 um). The sensor my group has chosen is TCRT5000 (Vishay), but we are facing several ...
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1answer
31 views

Pachislo Token Sensor Optical sensor replacement part#?

Pachislo Token Sensor Optical sensor As shown above I have a Pachislo Mazya Dynamite Kid's Machine which has a bad Token Sensor Booard. Can someone please advise on what a suitable replacement part ...
1
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1answer
64 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
31 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
46 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
48 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
46 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
104 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
196 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
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1answer
400 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. ...
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2answers
92 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' ...
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0answers
59 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 ...
2
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3answers
69 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
46 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
7k 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
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1answer
188 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 ...
2
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2answers
1k 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 ...
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2answers
38 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 ...
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1answer
449 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. ...
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3answers
881 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 ...
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1answer
2k 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
157 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 ...