Questions tagged [photosensor]

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3answers
66 views

identify infrared receiver

My CD player's infrared receiver for its remote control has failed. (The remote still works with a friend's identical player.) I'd like to buy a replacement receiver and solder it in. How do I ...
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2answers
47 views

Driving Avalanche Photodiodes (PCBs)

I am using Avalanche Photodiodes and I was told that they use a much higher voltage then standard photodiodes and I was wondering if I need a High Voltage PCB to drive them? I am currently just using ...
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5answers
175 views

Please explain this formula for the relationship between bandwidth and the temporal response of a photodetector

I am reading "Optoelectronic Sensors" by Didier Decoster and Joseph Harari. At section 1.8.2 they start explaining the relationship between rise time and bandwidth, and they give a very weird formula ...
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1answer
162 views

How to find polarity of photo interrupter

I have scavenged some photo interrupters from multiple printers but I am trying to figure out the polarity and the voltage. I've tried searching up photo interrupter polarity but couldn't find ...
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1answer
50 views

Dusk dawn motor driver with polarity reversal

I'm trying to accomplish this. When a dusk dawn switch is on, drive a small DC motor for a few seconds and then stop. when the dusk dawn switch is turned back off, then turn a small DC motor THE ...
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1answer
166 views

Photodiode temperature compensation

The goal is to design a circuit that can accurately measure light intensity with little temperature dependency. Common application uses photodiodes to do so. Photodiodes can be measured either in ...
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1answer
138 views

Replacing obsolete photodarlington with phototransistor

I've got an old circuit design I need to replicate, function wise, to fit into an existing larger design. Logic I can usually handle, anything with transistors starts to get me lost. My strength is ...
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2answers
261 views

Photo-diode for a high-frequency tachometer

I intend to build a tachometer, which is capable of detecting rotations up to 1kHz (60 000 RPM). From the Internet I know that this is possible to do with a magnet and a Hall detector. However, I ...
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1answer
245 views

Design of output stage for CNY70 reflective sensor

I have built the following circuit for a reflective sensor: The resistor \$R_D\$ has been given the value 200 \$\Omega\$ and the resistor \$R_T\$ is to be dimensioned. \$V_{CC}\$ is 5 V. I have ...
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1answer
78 views

Why popular line detection use Infrared(IR) based sensor? [closed]

Popular line sensor use IR LED as transmitter and IR photodiode as receiver to distinguish reflective color such as white and less reflective color like black. Consider that infrared LED is hard to ...
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1answer
53 views

Why there is difference between image size and video resolution of a specific camera? [closed]

I was searching to buy a camera, but I saw in specs they wrote: 2MP(full hd) video recording 5MP image size Why the vido size is 2MP but image size is 5MP? How ...
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1answer
3k views

How to increase sensitivity of Light Dependent Resistor (LDR) [closed]

I am using LDR sensor in my project. The source of light comes from the different colour of images. As we know, the spectrum of each colour is different and it will produce a different intensity of ...
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3answers
612 views

Detecting a very fast moving object with a photoelectric sensor

I want to use a photoelectric sensor to detect a ball that is moving past the sensor at 85mph, which also equals 136kph or 3800cm/sec. The ball is 7cm in diameter. If my logic is correct that means ...
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1answer
265 views

I need help in rewiring a chicken coop pop door

4 years ago I purchased an automatic chicken pop door for my coop. It is 12 volts and the door opens at dawn and shuts at dusk by means of a photosensor. It is a home built device that works quite ...
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2answers
82 views

LDR Photoresistive Track

I completely understand the working principle of light dependent resistor. But there is one thing I am bothered about: Does the LDRs surface has to be equaly illuminated upon all its surface/upon all ...
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4answers
326 views

Current to Voltage Feedback Capacitance for SiPM

I'm having an issue with my Silicon Photomultiplier (SiPM) feedback circuit. The output is not behaving as expected. My board schematic is below: simulate this circuit – Schematic created using ...
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2answers
44 views

Sensitive photosensor

I'm looking for an extremely sensitive photosensor. I have a setup where a beam of light of some sort (weak laser, or something else) will be shining into the photosensor. Every now and then, a ...
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1answer
322 views

Make a homemade photo sensor?

I have always wondered if it's possible to make a homemade primitive photo sensor for capturing photos in an acceptable range and in low resolution using environmental light? I know that it's possible ...
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2answers
2k views

Can LED be used for both light emission and sensing

I have read about LED in Wikipedia, and it says that LED can be used for both light emission and sensing. Is it possible to achieve this and how?
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0answers
75 views

'Resistive Array/Network' of Silicon Photomultipliers

For a project I'm starting, I am trying to create an array of silicon photomultipliers (start small, 4 or 6) which can be connected to one channel, and when they fire, you can detect which ...
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1answer
399 views

Photo diode / light sensor to detect backlight PWM frequency of LED displays?

Hi and thanks in advance I'm not from the field so please understand. I need a mean to detect a PWM frequency of pc/laptop displays externally. Some led displays use PWM mechanism to produce ...
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1answer
352 views

Extrapolating parameters for SPICE model for a Silicon Photomultiplier

I've been working on a circuit involving a silicon photomultiplier, but I'm having trouble modeling the SiPM in LTspice. I found an article below that shows a proposed model for an SiPM in SPICE: ...
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1answer
418 views

Modeling a photomultiplier in LTspice with basic components

I am working with the SensL MicroFJ-60035-TSV photomultiplier. A link to the product can be found below: http://sensl.com/products/j-series/ I'm trying to develop models with it using LTspice in ...
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1answer
90 views

APD temperature variation

I know that the gain (M factor) of APD (Avalance Photo Diode) changes with temperature at a give reverse bias voltage, therefore, we need to a compensation either using a thermoelectric cooler or a ...
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2answers
60 views

How can I get a raw image from a consumer camera? [closed]

I have an SLT camera (Sony A7R2) and while it has a raw output interface for video (via microHDMI out), it doesn't seem to have any way of outputting RAW apart from writing it onto the SD card. My ...
2
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1answer
977 views

DIY laser range-finder

I would like to develop a laser range-finder board similar to Extech DT300. I would like to achieve a centimeter precision at 20 meters. I don't know if devices such as DT300 use a "standard" time-of-...
2
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1answer
553 views

Help identify this IR receiver

This part came out of a Logitech nanoVX mouse. It is the IR sensor that is part of the scroll wheel mechanism. It has letters LT written on top and on the back it seems to have "H0fVE" or "HOfVE" or ...
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1answer
3k views

How do phototransistor and photodiode work in multisim ? How can one cause the photodiode to trigger the phototransistor?

I would like to design this circuit shown in the picture. I have simulated it in Multisim. It functions as follows: When the switch is open, the phototransistor is high impedance, when the switch is ...
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1answer
1k views

Photodiode - Modes of Operation, Currents and Voltages

Problem Statement Consider a pin-Photodiode, whose depletion region, space charge profile and electric field profile can be visualized as follows (screenshot of the Semiconductor Applet Service by ...
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3answers
83 views

Sensor to rapidly sample light intensity of a small area at a distance?

I'm looking for a sensor or method of rapidly sensing light intensity of a 1-inch x 1-inch square of a LCD monitor at a distance of 1-1.5 feet away. Does anyone know if such a thing exists, or has ...
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3answers
4k views

What are the limitations of using a LDR sensor?

I have to explain limitations for a photoresistor/LDR . I've read the book, and searched online but find nothing. Can I get help with this ? Are things that the sensor can NOT do, which other tools ...
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2answers
73 views

What is the term for a photo sensor that takes low-resolution, black-and white, closeup images?

For work I used to have to read and log 7-segment LCD numbers off this tiny (3cm x 1cm) screen tens of times per day. Now I have a webcam setup that reads it for me and does some OCR to automatically ...
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1answer
92 views

Help Interpreting “Max light exposure” rating for TSL1406R

I've purchased a TSL1406 Linear Sensor Array to read the position of a laser dot. The "Absolute Maximum Ratings" section in the datasheet specifies "Maximum light exposure at 638nm" as 5 mJ/cm^2. ...
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3answers
3k views

Help selecting component to detect red laser light [closed]

While I did find a little information in searching your site I am still unsure what to use in my application. I want to detect the (red) laser light hitting a screen or target. My questing is what is ...
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5answers
1k views

What type of photo sensor/light combo best for detecting a falling drop of water?

I am trying to setup a rig for water drop photography. This is where you take a picture as a water drop is impacting against another object or body of water. The trick is to detect the drop as it ...
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5answers
3k views

Can I build a camera that is sensitive at 2.4GHz?

I want to build a camera obscura as an art project that produces photos of WiFi signals. The idea for now is to build a 125cm x 125cm x 125cm Faraday cage (using fine copper mesh) with a centered hole ...
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3answers
191 views

Maximum output voltage from photo sensor to detect high intensity pulse of light

I'm trying to work with the OPL550 photologic sensor http://optekinc.com/datasheets/opl560.pdf (Sense a pulse of light around 8kW/m^2 in intensity and around 100us in duration to trigger data ...
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2answers
1k views

What is RadioShack 276-0326?

It says it is an ambient light sensor, but is it a phototransistor? Something else? It has Vcc and Vout pins. Bonus points if you include a data sheet.
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1answer
239 views

How to delay the transistor turning on using a photoresistor?

I am a beginner in electronics, my project is the following: I am trying to build a simple circuit to switch on and off my garden lights according to the brightness level. More to the point, I'd like ...
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1answer
819 views

Photocell and Relay switch not working properly

I am trying to build a simple circuit to switch on and off my garden lights according to the brightness level. More to the point, I'd like the lights to turn on when it's dark and off in the morning. ...
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4answers
178 views

cheaper alternative to RPR359F Photosensor [closed]

We all love summer vacation but there comes a time when you get bored of your Xbox and decide to start off a new project to keep you busy. Well this is what happened to me and I decided to build an ...
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2answers
90 views

Photocoupler interface

I found a CNA1011K photocoupler laying around and I wish to try it out. Could someone explain what the parameters from the datasheet mean and how to use them for particular circuit parameters? LED ...
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3answers
802 views

Term for a chip that is used in a camera to detect light

In terms of an integrated circuit, what is the term for a chip that is used in a camera to detect light? I hope this photo helps. What is the technichal term for the light sensitive IC in a camera?