Sensor Definition and 392 Threads

Hi all, My university did not provide any metrology courses as part of my degree, and our lab experiment sessions are not very hands on, unfortunately. Thus, I am a bit out of my depth. I need to calibrate some temperature sensors as part of my mechanical engineering internship. I have an 8...

I am using an algorithm that transforms from my sensor frame to North West Up and I want to instead use North East Down. I have attached the current algorithm. I also want to skip the first step in my algorithm. Here is the current algorithm: http://www.filedropper.com/transformationalgorithm...

I am working on a system that uses capacitance sensor probes, the system components are the probe, triaxial cable with LEMO connectors, BNC cable, oscillator, and a demodulator. I have had some trouble finding ways to troubleshoot the system other then basically testing continuity. Are there any...

Homework Statement There is a wind tunnel force balance allowing the measurement of the drag force resultant at point A of a test object in the air stream from an arm and lever system mounted on a pivoting point O and pressing onto a force sensor at point B. 1) What will be magnitude of the...

Hi To detect position of a metal we can use the eddy currents induced by a current carrying inductor. It is described in this link. http://www.marktec.co.jp/e/product/ndt/ect/principle.html Would this still work if the target is a magnet enclosed in a metal casing. Basically I need to detect...

So we're using NXT 2.0 and MATLAB to program a robot to follow a white line through a maze. I'm using a light sensor, color sensor and an ultrasonic sensor in the process. Any programming/Coding ideas of how i should start? This is the maze...

Hello everyone, I am not sure if this question is comfortable in the chemistry section but I will try my luck. I have been dealing with lambda sensors a little bit and when I look at the characteristic voltage lambda curve I keep asking myself why it flatens out when getting into the rich...

Hello, I would like to make a connection between a motion-sensor and a set of tubelights. This is not that hard, but I would like to do this over a large distance... It seems a good idea to use the internet for this. I can get or make a motion-sensor with a USB connection and connect it to a...

In the process of building my ebike I came across problems of measuring current without putting a sense resistor in the power circuit. For that we build a USB based non invasive current sensor which measures current from -100A to +100A. We also did a kickstarter although It looks like not many...

So I've been researching whatcould be the sensor/s that would do what the picture depicts: I have camera A behind camera B. What I'm trying to achieve is: to point the position of camera B when B passes on the field of view of A. When B pases in front of camera A the Screen of camera A will...

Dear Colleagues, I am working in the design of one packaging for pressure sensor (piezoresistive), this packaging should be really cheap, I want to use a layer of parylene to cover the surface of the Silicon Pressure sensor, which include the diaphragm with the piezoresistive materials, I am...

Hello everybody, apologies from outset for bad English. I wonder if anyone can give me some advice regarding my problem. I have a sesnor that gives acceleration readings. I have been working hard to turn these readings into position or displacements. I tried many method but MATLAB cumptrapz...

Hi all! I have a question that maybe some people of this great comunity can help. I´m working with a platform with 16 MEMS accelerometers distributed along the whole surface with a knew position and orientation, I have to measure the differences in acceleration on the Z axis, to get the surface...

Hi everyone, I have this question for you: In Instrumentation, when connecting the input of one circuit to the output of another circuit,(for instance, connecting the output of a sensor to the input of an amplifier circuit), a loading problem may arise, could you explain to this problem ? And...

I was taking apart a CPAP (continuous positive airway pressure) humidifier earlier and found 2 of these sensors spaced around 5 cm apart from each other. They were in an air conduit leading from a filter material on the outside of the device to the pump intake. The points of the sensors were...

Homework Statement See picture. The Attempt at a Solution So, based on the two questions I looked at the graph and calculated the corresponding values a) 40 cm b) 200 I checked the solutions which say: a) 40 cm b) 20 cm Is their answer for b) a typo, or am I reading it incorrectly?

Homework Statement A temperature sensor has a full scale output of 0 to 5 volts which corresponds to a temperature range of 0 to 100ºC. If the sensor is interfaced to a 12 bit Analog‐to‐Digital Converter (ADC) with a full‐scale output range of 0 to 10.0 volts, what decimal value will the ADC...

Homework Statement Hi: I'm researching for a arduino sensor that measures resistance of a material depending on the temperature. I have also not found the word that describes the characteristic when measuring resistance-depending on temperature. Homework Equations 1) Is there any type...

So I have built an incomplete rig to measure the pressure of a setup I have in a lab. The pressure sensor is hooked up to electronics and I have not used the electronics (basic National Instruments electronics) and am not sure if did the wiring correctly. The setup I have basically has a bottle...

I am looking for a way to make my own "force sensor" similar to this Vernier dual-range force sensor for high school physics labs.(Vernier) How is this different from a digital spring scale, like for fish? Can digital spring scales also measure pushes? Can the components be purchased from...

Not really sure if this should go here or in technology, but it's a physics class sooo... we had to build a device to measure the power of a laser with an output of around 10mW or less. I went with a differential gain amplifier using 2 thermistors, one of which is kept at ambient...

Homework Statement Hardware redundancy is important in many real-world engineering systems. Specifically, installing multiple sensors that measure the same quantity provides a level of safety in the event that one instrument fails during the mission lifetime. You do not want an expensive...

I wanted to try using a Darlington pair with an ion chamber (small tube) to detect alpha particles, as this site explains: http://www.techlib.com/science/ion.html Before I order any components, I was wanting to throw something together with some normal transistors I already have. I was...

Homework Statement Need to design a system where the lamp (output) turns on when sound is heard and turns off after 10 seconds of no sound, but it must also be dark (light sensor).Homework Equations The Attempt at a Solution I have put a Light Sensor (that is set to let current flow when it is...

I want such a setup that when i touch the sensor, a circuit (including batteries) kept at a distance of less than 6 m gets complete and the bulb lights up and when i leave the finger from sensor the circuit breakes and the bulb stops glowing. i.e. the switch of the circuit in in the control of...

I am detecting detonation in a SI engine using a knock sensor (pizeo element). What I would really like is to have 3 leds that light up as the knock gets more severe. I have the knock sensor running into an op amp powered by a 9v battery. I am listening to the output with a pair of head...

Sorry I don't have a picture right now. But this has had me wondering and I can't find anything online about it. In my college in all the bathrooms and laundry rooms I see these sensors in the ceiling which is just a 6" metal rod hanging. There are your regular smoke detectors and everything on...

I have come up with a new idea for an energy saving project for my course (which has a novel element - they're not expected actual ideas to take off) Having thought a few things over, I am now thinking of simply saving energy in office's, particularly where offices are divided up into...

Hello, What is the best multiplexer to use if I want to manually create a 500 pixel sensor array and display it on to an LED or LCD screen? Thank you,

Homework Statement An imperfect sensor measures the weather (which can only be either sunny, cloudy or rainy) in a fixed place. Suppose we know the weather on the first day was sunny. In the following days we obtain the measurements cloudy, cloudy, rainy, sunny. What is the probability...

1. Lab Method The method for determining the Hall Effect is as follows: This is the method that I was instructed to follow: A current source was connected across a germanium wafer The voltage across the wafer (in the direction of current) was measured with a multimeter A magnetic field was...

im a student working trying to start a project creating a motion sensor and camera outside my door way, was wondering if anyone had any ideas of how i should get started. i don't want to buy the sensor because i want to learn how to produce the product from scratch, any help would be great

I have a pressure sensor that gives off 4 volts when actuated and I would like to transmit it a distance to an LED light. So I found these RF Link Transmitter/Receiver at 434MHz: https://www.sparkfun.com/products/10534 https://www.sparkfun.com/products/10532 The data sheets and...

Evening gents, We've built the following circuit in the lab for our DC-DC converter for an electric motorcycle. The blocks from left to right are, High speed optoisolator IR2110 Gate driver IC MOSFET Power buffer circuit MOSFET Power Module PMDC Motor ~48V...

Hi guys I hope you can help me a bit to understand a problem. I want to build a prototype of an insole/shoe which can meassure the force applied through a step. I´m thinking of placing a small rubber tube into the shoe, and then bending it smoothly a lot of times, so it will cover most of...

Hi all, I have a piezoelectric pressure sensor from KISTLER instruments. (http://www.intertechnology.com/Kistler/pdfs/Pressure_Model_211B.pdf). I am pretty new to this field and wondering how to process the signal from these sensors? I have data over a 3 minute span from this sensor(taken at...

Hi, I am building an underwater quadcopter and I need a depth/altitude sensor for the platform to automatically keep the same altitude above the seabed. I have done some research and I could not find anywhere an off the shelf depth sensor so I figured that I will make one myself, so I...

Im currently designing a system to convert my cable pull throttle to an electronic one as part of a bigger project. Initially I was looking at using a potentiometer to indicate how far the acvelrator pedal had been pressed, but am wary of such a system due to the potential wearout. Can someone...

I would like to design an umbrella system that will be attached to your table for outdoor restaurants that works upon a rain sensor system for my final year project. So, in case while you are having a wonderful meal and suddenly it rains, you don't have to worry as the umbrella will...

Hello, I'm putting together a sort of electronic flute and I'd like to be able to use a sensor to control expression with breath. It needs to be small enough to bring up to the mouth to control, rather sensitive, and the cheaper the better. Any suggestions?

Lets say a sensor measures within accuracy of +/- 0.05N And you take multiple measurements and graph it out. (I.e., 5.12N, 5.15N, 5.05N...). What is the uncertainty of the final average? One way I read is: Sx = s/√N where s = std. dev. N = number of data points But...

Hi all I would like some ideas and pointers on how you think that I could drive my electromagnet to turn on/off with some form of optical sensor. I’m using a 12V 3.6A battery. I’m not too knowledgeable in the optical sensor arena. So if you have any ideas on how I could drive this inductive load...

Greetings PFers, I was thinking about how it would be possible to "scan" something without having visual or physical contact (and without have a superconducting magnet, etc...) Lets have this device detect something conductive. If a device were to emit an electric field pulse of very...

Hello everybody, I was working on an electronics project, and one of the LEDs (actually I'm using only one) started acting really strange! It will light up when I come close to it, ONLY if I have been out of the room for some time! And that's not all, the period for which it will light...

I'm confused about this. I'm looking at two point and shoot cameras. One is 10MP and has a sensor of 1/1.7. The other is 12MP and has a sensor of 1/2.3. According to this wiki article: http://en.wikipedia.org/wiki/Image_sensor_format, the 1/1.7 sensor is physically larger than the...

Homework Statement Airbag Sensor To trigger the airbag, accelerometers are used. A simple sensor is composed of three parallel plates of the surface A, which are connected to a condenser system. The mass m of the middle plate can move between the two fixed outer Moving plates. She is...

I have a part with a 2.5mm hole that sits inside a fixture (I need to verify hole presence), the hole can move anywhere around the slotted area due to part flexing, install force, etc. One idea I had was point an 850nm InfraRed light from the other side at the hole, then mount an IR light...

Hi. I am mechanical engineer , and I have presentation somewhere next week about sensor of my choosing. The thing is:I picked sensor which is a research project ,and the sensor is flow sensor,using hot wire technology . Not only this entire subject confuses me (measuring flow using heat...

Hello everyone, I'm a photographer and am developing a project in which I'm needing some help. I went to some engineers friends first but they told me Physicians would be the ones who would have the answers I need. I'd like to know how can I interfere in the way my camera's sensor...

Hi i am doing a side project of displaying RPM speed on the Altera development board DE0 which i have running at 10MHZ. i have got a digital input from a hall effect sensor that has a frequency range from 1.6 to 166.6 Hz. the signal incoming has a duty cycle of 50% to calculate the...