Sensors Definition and 153 Threads

Hey guys, since this seems to be the brainiest place on the web for physics and engineering topics, I was wondering if you guys can help me out. I have to do a short encyclopedia page for my semi-conductor class about sensor applications. Now, after doing a little bit of research, I thought...

Wasn't sure where to post it as there is no medical engineering forum but... Is it possible to attach a sensor to a neuron in a human body and get the human's neuron to react to the sensor being stimulated?

And are any of these sensors stable? What is the effective resolution that we get from these sensors?

Hi, why does a sensor, eg a temperature sensor, have an accuracy? Is it just because of a random error, or something intrinsic to the sensor itself and is it related with the resolution?

Especially one that's recent? It's awfully hard to find anything on the Internet.

Hi every body Could anyone give me some useful links for electromagnetic sensors ! definitons,types or how they work,, Thanks a lot

I have to do a project involving force sensors. I was wondering if anyone knew if there is any good books on how to build them or a book that explains how they work so I can build my own.

what is planar technology?

Hi I am relatively new to electrical engineering, I want to make my own parking sensors for a motorcycle, don't ask me why, I would just like to play about with the idea. Could anyone suggest what sort of sensors I would need and frequencies etc?, I am looking to have one separate transmitter...

Hi guys. I have a question. See figure 2.1 in the PDF file, page 13. Basically we have a radiation sensor (sensitive only to infrared light) and we have a light bulb in front of it. We must make some measurement to see that the inverse square law holds and so we must measure the "intensity"...

Does anyone know where I can purchase an inexpensive force sensor ? Thanks.

Hi, I am a final year student whos doing engineering degree. My final year project involves tracking the speed of a swimmer inside a pool. The current problem is that i don't have a good way of monitoring the swimmer's speed, which needs to be quite accurate(centimeters). Due to different...

I am designing a system that must automatically detect if a person is inside their office. The trick here now is that there are people going in and out and i just want to detect the owner of the office. Tracking them is useless since the average office sizes are not big, 5m width maximum so my...

Hey Working on a rather large project and it's the first time I've had to look into the world of pressure sensors. Basicly, we're looking into measuring flow levels in small rivers, either in areas where we build a profile to gather up the water and in natural areas where there's no need...

I want to use an "inductive proximity sensor" for metal detector gate, but the problem is its range is (generally) under 50mm (2 inches), is there any way I can increase its range? or is there any alternate sensor or way to detect the metal ? Thank you. Faraz Nizamani

I need to convert quaternion (q) to a form that is suitable to show changing attitude of a Satellite. like new x,y,z vectors of a satellite.I don't know the math of quaternions. I am getting updated state using rung -kutta 4 method where state vector x=[q(1:4) wx wy wz a(1:3) b(1:3)].I can...

Curious. I have a video camera and I've decided to take it apart. I posted a thread a while ago about building a robot, so It would be nice if somehow i could use something from this camera to give it "vision" or "Senses". So I want to know. Do these things have sensors in them? Is that how they...

Hi All, Wondering if someone can give me some pointers on some fluid level sensors or switches. He is a short run down on what I want to achieve. What we want to do is create a system where we can keep a fluid level (dye based Ink) a constant level inside a chamber. We are confined...

Hey guys I'm building a robot and just finished all the circuit work, and am now working on programming it. I got all the basic movement functions down, but am having trouble with a few things. How do you make it turn..fast? i can make it turn but its horrible. Also i have two light sensors put...

I have four dual technology (alarm type microwave & pir) sensors, which I would like to wire up as motion sensors that operate a light or buzzer only during the period of detection. The sensors are Rokonet brand, model RK815DT, which display three frontal leds: m/wave, pir, alarm trigger. They...

Hi all, Through my tears, I'm trying to compare two acoustic emission sensors. The first sensor has a specification that says its sensitivity is −150 dBre 1V/μPa. The other sensor says its sensitivity is -70 dB ref 1V/μbar. (Note the different units.) Wikipedia tells me that 1 Pa = 10-5...

I recently had a new fan installed on my laptop because the old one died on me, and even though the new fan is working fine I'm having overheating problems now. I didn't know what the problem was at first until I checked my laptops temperature readings using speedfan. At first it made sense that...

Is noise in sensors always gaussian? I was playing with acceleromter data in matlab. I decomposed the data into high frequency and low frequency. The high frequency noise distribution looks like a gaussian. Is this common to sensors?

Hey everyone! I recently picked up a motorcycle for class/work commutes because walking home at 11pm from the lab is not fun. But I have come across something of interest. Some intersections keep a green light on the main street and red on cross streets until a car pulls up. Before...

In a nutshell? i cannot seem to find a lot of information online about these. Could someone please help? thanks!

Homework Statement AD590 is a temperature sensor, through which a current of 1µA/K flows. AD590 is a sort of temperature sensitive transistor and can be interpreted as a current source. With two such sensors, you would like to measure the difference between temperatures T1 and T2 using a DMM...

We are going to be using flexi force sensors to profide force measurements between two steel plates.. has anyone used these sensors before? http://www.tekscan.com/flexiforce.html

I'm studying AS Physics, and we're doing the sensors project for our coursework. WE can use LDRs, Thermistor, rotary sensor and a variable resistor (length). I have to think of a context to the measurements, and our teacher wants it to be witty and original, but have no ideas! Examples of...

I am trying to find a position sensor that can measure the relative position in respect to a control line (not point) in 2-D. I do not need to know the height of the object, just the XY position. The control sensor I assume would be 2 separate sensors creating a line in the +- y directions at...

request for water level sensors circuit! anyone got the water level sensors circuit? can share with me? really appreciate !

Hi I would like to know if there is a sensor available in the market that would help control the intensity of light given out by a white LED, taking into account the light coming from the surrounding ambient light. As an example I am trying to implement a project in which I would have to control...

Hello everyone, I intend to make a "Digital bus arrival information panel".The circuit will be built into my product.So when a bus leaves,the sensors activates a bulb to flash for a time period(e.g 15 mins).Here is a picture similar to my idea...

Hi all.. I have been working on a project which involves the measurement of ignition delay of fuel droplets using optical sensors of the beam-break type. What my project supervisor has asked me to do is to fabricate an apparatus in which such measurements could be made. The basic principle...

Can anyone tell me how does a light sensor work?

If I have 2 limit sensors set in a circular arc around a rotating servo motor, and the angle between them is 83°, approximately what is the angular range of motion that I can achieve? Please take into account, and let me know what clearances I need to be aware of (i.e. how many degrees clearance...

hey guys, i don't know if I am in the right part of the forum, but i have an idea and i need your help... i know nothing about physics :confused: my idea is to build a sensor into a guitar which could alter the pitch or cut out the sound, like a kill-switch for example. anything is...

Ok the current situation I have is a magnetometer that measures heading, \psi, and a rate gyro measuring r (the euler equivalent of \dot{\psi}). To start with, I'm confused that one measures according to the aircrafts body framework and the other doesn't seem to...but anyway, the main question...

I have a question regarding ultrasonic sensors. Let's say for example I want to use a typical ultrasonic sensor, in this case let's say: http://www.jameco.com/webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=136653 in a circuit for distance detection...

Hi... can anyone tell me where can i find theory about gas sensors (made of ceramics) online? what principles is used to detect the presence of gases? thank you.

Hello everybody, This is my first post and I need some help in my AS Advancing physics OCR coursework. My coursework is about seeing how well an LDR responds to various frequencies of light (eg 5Hz, 10Hz...). I am looking at responding times. I have got data about extra time taken to respond...

Hi, I'm trying to make a touch sensor pad using a grid of temperature sensors that would be covered with a thin, heat-conducting rigid sheet. I need these sensors to be able to pick up the temperatures on the sheet above them when the sheet is touched with the fingers and give the readout to...

I'm wondering what are the pros and cons of the CNT sensors and conventional gas detectors? I know that CNT sensors can detect very low chemical adsorption energy, which a conventional gas detector probably can't. Besides that, is there any more pros and cons of the two? Thanks!

Hey guys, I'm trying to propose an appropriate resistance based sensors to measure the deflection of a beam and the strain of the metal on the underside of the beam for an old peer with steel beams which are somewhat corroded. The system has to measure the strength of these beams. I'm trying to...

Hi guys! have to build a hovercraft as part of a third year Eletircal engineering project. It must hover through a maze without touching the sides of the walls. I've decided to use ultrasonic sensors to measure distances as opposed to infra red (reason being - ambient lighting will pose big...

Hi, I'm trying to control some solenoid valves and sensors with a microcontroller and I'm not sure what type of circuitry might be used to best accomplish this. For the outputs I think a ULN2003AI made by Texas Instruments might work but for the inputs I'm not real sure what I need to take...

Hi all, Does anyone know about the working range and market availability of the induction coil sensors? The field that I am dealing with is in the range of 2000-5000 Gauss and it's not suitable to use a Hall-Effect Sensor. Thanks, Mike

Hi to all. I am a new member and I hope I've posted this thread in the right section. Well, I'm an Electrical Engineering Student. I've got a problem. We've been asked to answer a question about photometers or luxmeters used in the Ulbricht Integrating Sphere. The main question is why does...

hi, me and my friends all help each other with physics, and we've been tolk that in our test next year there will be somthing on senseors so we thought a little project wold further our knowledge! So i think I am going to do one on comparing Photoelectric smokealarm sensors to ionization...

Hi I'm new to the forum and I have a question about position sensors. I am looking to obtain a position sensor, to be used in the construction of a musical instrument. The sensor will not only sense the presence of my hand in front of it, but will also determine the position of my hand...

Hi I'm doing my physics coursework, and am rather stuck. It's on senors, we have to choose a make a sensor and then use/test it etc - First problem: I'm using a photodiode and, I've put it in parallel with a mulitmeter, reading it's resistance, at different light levels. i have...