Questions tagged [photosensor]

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Choose a photodiode with sensitivity matching a computer screen

I am showing a rectangle on a computer screen that needs to activate a digital (0/1) photodiode/photo detector that should only be activated when the white rectangle is shown on the screen. I have ...
Anton Andreev's user avatar
0 votes
1 answer
31 views

Can TSOP1130 work also at 850mn?

In the sheet, they test it with a 940nm IR LED. There are no clear specifications for the wavelength (range) it works with. But I have 850nm LEDs (powerful ones). Will it work the same, or will it ...
IceCold's user avatar
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1 vote
1 answer
132 views

Determining the maximum input power of a photosensor for a given laser power input

I need to measure the average power of a 1550nm pulsed laser output using a photodiode. The datasheet of the Thorlabs FDG03 photodiode can be found here (or if these links fail, the product page with ...
floppy380's user avatar
  • 1,835
1 vote
1 answer
61 views

How to have photo interrupter drive a MOSFET when interrupted? [closed]

How do I get a photo interrupter drive a MOSFET when interrupted? I don't currently know what MOSFET I'm going to get. The battery is going to be two Energizer max 9V connected in series. The load is ...
max mowbray's user avatar
3 votes
2 answers
270 views

I want to detect IR beam of 1064 nm from my rangefinder that will be at least 1200 m away

This question is different from IR sensors not working in sunlight because the principal difficulty is distance and because the sent signal can't be changed in any way All the sensors I am using are ...
defoxtrotalpha's user avatar
0 votes
1 answer
106 views

Need theoretical understanding of basis of IR sensor design

Below is a cutout of the IR sensor part from a heart rate sensor schematic. I need to understand how this part has been designed, what is the basis of the choice of the two resistor values R1 and R2, ...
DribbleNibble's user avatar
0 votes
2 answers
182 views

Characterizing a PIN photodiode's 3 dB bandwidth

I'm currently attempting to characterize a PIN photodiode's 3 dB bandwidth. The photodiode input is a laser source that is being modulated by an ESA RF output that performs a frequency sweep from 0-1....
SamsUncle's user avatar
0 votes
1 answer
245 views

Choosing the right LED IR and the photodiode for optical beam sensor

I need to design an optical beam sensor for about 15-20 cm of distance - any obstacle between an emitter and a detector would trigger an interrupt for a microcontroller. I was thinking about using a ...
Adam's user avatar
  • 135
1 vote
2 answers
113 views

Pulse sensor issues and How to get -5V from Arduino

So I'm trying to make a pulse sensor using TCRT5000 IR sensor and arduino UNO (giving out 4.8V really from 5V pin) (Baud Rate 19200), and I'm supposed to get a pulse plot like this But I'm getting it ...
DribbleNibble's user avatar
1 vote
2 answers
185 views

Understanding opamp amplifier (simple) behavior - Having trouble understand basic opamp operation

I'm trying to understand the operation of opamps, especially how to amplify a voltage as illustrated in the images from a (for example) photoelement so these can be used a the following comparator. ...
ulix's user avatar
  • 183
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1 answer
292 views

Reading 100s photodetectors

I'm trying to measure light intensity at a lot of points in a project. I have about 250 photo detectors (BPX 65). When I had just 1, I tried connecting it to an Arduino board. But I'm not sure, what ...
user319750's user avatar
6 votes
1 answer
1k views

Photodetector for short laser pulse

I'm looking at building a detection system for fast laser pulses (532nm wavelength for 250 ps duration). It seems to me that this will require a very fast photodiode with sub nano-secind rise time. ...
Thomas Holle's user avatar
3 votes
2 answers
525 views

1940s phototube collector material / datasheet for a tube

I have browsed countless pages on Google but cannot find a datasheet that tells you the material/element of the collector plate (the semi-circular plate in the tube) in a phototube (not a ...
Darmstadtium's user avatar
-1 votes
2 answers
356 views

Procedure to express radiantion intensity of a LED in watts/cm^2 , given luminous intensity or total radiant power [closed]

I am calculating Responsivity of a PN junction photodiode by irradiating radiation from LED sources. For this purpose, I have two LEDs, one UV and another green LED. Note that LEDs are placed close to ...
abhishek bhat's user avatar
-4 votes
1 answer
159 views

In this circuit, the light intensity sensor (LDR) only senses 3_2 cm. How can I improve the sensitivity of this sensor to reach 1m?

In this circuit, the light intensity sensor (LDR) only senses 3_2 cm. How can I improve the sensitivity of this sensor to reach 1m? https://ibb.co/c3X1NRS
Forkan Xa's user avatar
1 vote
2 answers
138 views

Extracting two signals from a photosensor

I have a circuit that pulses two LEDs on and off at the same frequency but out of phase. I would like to find a hardware solution for using one sensor to measure separately the intensity from each ...
bobthechemist's user avatar
0 votes
2 answers
307 views

Problem in sensor circuit using a Phototransistor for the Schmitt Trigger circuit

This is my Schmitt Trigger design, which trips at \$2.3V\$ and \$1.7V\$- Here, $$+V_{cc} = 9V$$ $$R1 = 51k \Omega$$ $$R2 = 22k \Omega$$ $$R3 = 330k \Omega$$ \$V_{in}\$ is a square-wave with 0-7V peak ...
electrovolt's user avatar
0 votes
1 answer
100 views

Reverse photosensor is activating an LED but won’t activate a motor

I am trying to use a photosensor in reverse so that it activates when it is dark instead of light. I am using a 2N222 transistor. I tested with an LED and it works fine, but when I use the same ...
Samantha Garcia's user avatar
0 votes
1 answer
223 views

Connecting photoelectric sensor to Arduino for distance measurement

I've purchased some of these sensors"S15-PA-2-A00-NK" and I would like to use them as distance sensors to be read by an Arduino. I have no idea what type of signal the sensor even outputs or ...
BigBadBatta's user avatar
0 votes
1 answer
61 views

Photogate is unresponsive - no output signal

I am trying to use this photogate with my Arduino Pro Mini (5V.) I am having no luck getting any readings from it. I measured the voltage across the emitter and got 4.5V, which should be enough to ...
Lil Mami Chula's user avatar
1 vote
1 answer
114 views

I want to register a small change of voltage of a photo sensing diode at bullet's speed

What I intend to do Estimate Accuracy of a Bullet Hit from the Bull's Eye: Use a row of light sensing diodes like BPW34 (or you suggest) spanning a feet vertically and horizontally or so with laser ...
AJ HUNTER's user avatar
4 votes
2 answers
1k 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 ...
curioso's user avatar
  • 67
0 votes
1 answer
381 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 ...
ma9's user avatar
  • 5
0 votes
1 answer
442 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 ...
ma9's user avatar
  • 5
0 votes
2 answers
48 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 ...
Dominique's user avatar
  • 359
1 vote
0 answers
83 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/...
Tiago Conceição's user avatar
1 vote
2 answers
358 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 ...
Sam Stoddard's user avatar
0 votes
1 answer
825 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 ...
Shalomiehomie's user avatar
1 vote
1 answer
110 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 ...
Seyedali Hosseini's user avatar
1 vote
0 answers
66 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 ...
John's user avatar
  • 11
0 votes
1 answer
196 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 ...
alpha027's user avatar
  • 101
0 votes
2 answers
96 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 ...
FourierFlux's user avatar
2 votes
2 answers
257 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 ...
Wjx's user avatar
  • 185
0 votes
1 answer
721 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 ...
nvuono's user avatar
  • 547
2 votes
1 answer
144 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 ...
taichiii's user avatar
3 votes
2 answers
1k 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 ...
SUMY POULOSE's user avatar
0 votes
3 answers
212 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) ...
Sam's user avatar
  • 53
1 vote
1 answer
395 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?
Smoking Diesel GR's user avatar
2 votes
2 answers
164 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-...
Ruslan's user avatar
  • 864
1 vote
1 answer
675 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 ...
Sean.D's user avatar
  • 37
0 votes
2 answers
784 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 ...
Dai's user avatar
  • 143
0 votes
1 answer
130 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 ...
CristoJV's user avatar
  • 103
0 votes
3 answers
143 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/...
ChemEng's user avatar
  • 103
0 votes
1 answer
115 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 ...
Weskm's user avatar
  • 1
1 vote
1 answer
1k 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 ...
dobbs's user avatar
  • 113
2 votes
2 answers
137 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 ...
str3r's user avatar
  • 23
0 votes
3 answers
1k 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 ...
Camille Goudeseune's user avatar
1 vote
2 answers
286 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 ...
James's user avatar
  • 113
3 votes
5 answers
1k 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 ...
Fernando Franco Félix's user avatar
1 vote
1 answer
1k 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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