Questions tagged [photosensor]

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4
votes
2answers
247 views

What is the “collector light current” of a phototransistor and how does it relate to the collector current?

I found the "collector light current" term in this datasheet (Vishay TEFT4300) but I can't find a definition for it on the internet nor figure out how it relates to the collector current. I ...
0
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1answer
47 views

HP C9017 Photosensor wire colors [closed]

I have at my disposal a photosensor (Optical encoder) with "C9017-80055", it has three cables: Black, Green, and yellow. I want to know the circuit (GND, VCC, output) to connect it with ...
0
votes
1answer
93 views

Trouble understanding OEM HP Sensor CB781-80006 circuit [closed]

I am having trouble understanding an OEM HP Sensor CB781-80006 circuit, I'm a beginner in electronics. Does anyone know to tell me what are the values ​​( VCC, GND, and outputs ) this sensor was ...
0
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2answers
41 views

I can’t remember the name of that component

I’m looking for the name of the component that act like a relay but instead of using a coil to generate a magnetic field that moves the relay « arm » it uses a LED and a photosensor. It allows to ...
1
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0answers
71 views

Current sensor that works in 0nA-250nA range?

Is there any current sensor capable of sense very low current ranges from 0nA to 250nA? I would need to sense the current produced by this photodiode: GVGR-S11SD (http://www.geni-uv.com/download/...
1
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2answers
95 views

Need help with break beam sensors for an art installation

I've been commissioned to create a piece of public art that fuses technology, light, and sound. The final piece must have six beams that can be broken and trigger musical notes. My first idea was to ...
0
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1answer
43 views

Photo eye sensor signal wiring

I am trying to install a photo eye to use for a lay down bottle sensor. I wired in the power, it turns on the light on the sensor flags when triggered. But I’m not abel to trace where the signal is ...
1
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1answer
42 views

Existence of input signal to LED at photodiode output

I try to make simple LED/photodiode circuit by arduino and 741 op amp. I used mid-IR LED by 200mA current and suitable photodiode for it. I wanted make pulsed signal by digital output of Arduino UNO ...
1
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0answers
51 views

Color Sensor Range

From what I've seen in spec sheets for modern color sensors (as of late 2020), the optimum sensing range is generally on the scale of centimeters. I am curious about the physics that can explain this ...
0
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1answer
38 views

HP C8941 Photosensor operating voltage and circuit

I have at my disposal a photosensor (Optical encoder) with "C8941-80018", it has three cables: Black, Green, and Blue. I want to know the Operating voltage for this optical encoder and a ...
0
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2answers
58 views

Low precision flash detector

I'm interested in flash detection, what would be equivalent to 1000 FPS. High speed cameras that do this are too expensive and too heavy and provide too much information. In the long run I'm going to ...
2
votes
2answers
87 views

Detecting small AC current signal generated by phototransistor

I'm trying to detect a small AC signal (~10kHz) generated by a phototransistor on a magnitude of 10nA~1uA using the following circuit by converting the signal to voltage signal first and then filter ...
0
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0answers
58 views

How to Modify IR Auto-Close Circuit for Trash Can Lid

Just bought a new trash can with an automatic lid that I'm fairly happy with but there's one modification I'd like to make. If I place the trash can in a cabinet and close the door it detects the door ...
2
votes
1answer
93 views

Phototube experiment with op amp

I'm working on an experiment to find Planck's constant with a phototube. I built the following circuit and pointed an LED light to the phototube in a dark room, but I had a few problems: When there ...
3
votes
2answers
261 views

Reflective optical sensor

I am working on a project that uses a TCRT5000 reflective optical sensor. Sensor datasheet is here I tested this sensor in a room, the voltage at the output pin is high it is above 2.5V. While ...
0
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1answer
59 views

Photo-multiplier Tube Pin Configuration

Pin configuration of a photo-multiplier tube (PMT) is presented in its manual as can be seen in the attached image. All dynodes have been related to specified pins (numbered circles in the image) ...
1
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1answer
132 views

HP C8941 Photosensor wire colors

I removed a photosensor from an OLD hp Inkject Printer. The photosensor is called "C8941-80018". I can't find any datasheet online. Does anyone know what wire color is what?
2
votes
2answers
106 views

What is the origin of multiplicative noise from a DSLR sensor?

I'm trying to understand the behavior of my DSLR camera sensor (Canon 80D). I've taken a picture of a gradient from top-right to bottom-left corners of a square. This square is positioned at the right-...
1
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1answer
99 views

Solar Panel-Photocell Wiring

I am trying to help my dad with a project of his where were trying to build a lighthouse powered by solar panel in which it spins a motor at night and charges battery during the day. This is a DC ...
0
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2answers
364 views

What options exist for a for low-latency (<1ms) photosensor?

I'm wanting to build a computer keyboard-to-display lag measuring tool using an Ardunio: User places the photosensor right-up to their computer monitor. User presses a button on the Ardunio. The ...
0
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0answers
29 views

5 wire, Logic Output Photointerupter/Slotted Optical Switch

I am trying to get a digital output from a 5 wire photointerupter. The p/n is OPB903w55z, it is configured as an inverted open collector. I have used 4 terminal transistor output photointerupters ...
0
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1answer
45 views

Is the charge accumulation linear in time for image sensors?

Reformulating the question: Does the rate of charge of the pixels photodiodes in an image sensor depends of the previous accumulated charge? The pixel sensor integrates light during a specific ...
0
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3answers
101 views

Infrared Sensor for drug detection [closed]

I saw that there has been a push to make a drug detector that can identify cannabis since it has been legalized. I was looking at mouser.com and found this ir sensor: https://www.mouser.com/...
0
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1answer
42 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 ...
0
votes
1answer
317 views

Convert a Dusk-to-dawn outlet device to Dawn-To-Dusk? [closed]

I recently purchased a Dusk-to-dawn outlet sensor (https://www.amazon.com/dp/B00002NB2X?ref_=pe_2640190_261118450_302_E_DDE_dt_1), but I'm wanting to convert this thing into a Dawn-to-Dusk device ...
2
votes
2answers
120 views

Can linearity of photoreceptor be improved by calibration?

I am trying to determine if equipment I already have can be used to take a reading in mcd/m2, for a quality control test. I have a sensor which meets all the requirements listed in the standard test ...
0
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3answers
601 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 ...
1
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2answers
160 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 ...
3
votes
5answers
439 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 ...
1
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1answer
680 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 ...
0
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1answer
150 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 ...
0
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1answer
499 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 ...
1
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1answer
241 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 ...
0
votes
2answers
518 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 ...
0
votes
1answer
739 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 ...
-1
votes
1answer
84 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 ...
-1
votes
1answer
57 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 ...
1
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1answer
5k 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 ...
1
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4answers
1k 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 ...
1
vote
1answer
582 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 ...
1
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2answers
110 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 ...
0
votes
4answers
452 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. I apologize for the layout of the schematic, but this was the best way I could ...
0
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2answers
48 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 ...
0
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1answer
563 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 ...
8
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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?
1
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1answer
717 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 ...
1
vote
1answer
567 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: ...
1
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1answer
671 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 ...
-2
votes
1answer
106 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 ...
0
votes
2answers
63 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 ...