Sensor Definition and 403 Threads

Hi all, I'm new to the forum so I hope I'm posting this in the right place. I'm currently working on a senior design project which requires my team to create a working prototype of a coaster that changes color based on how full the drink on top of it is. We plan to control the prototype with...

I am working on a project in which I am going to measure the human punch. which sensor should I buy?

I want to choose a sensor which can sense the current flowing from the electricity meter of the residential houses, the sensor should be able to sense the shape of electrical signal each second that how it looks like. can some one help me with that ?

Hello, I am part of a synthetic biology team whose goal is to modify immune cells to respond to an incident wavelength of 670-702nm and emit a near-infrared wavelength of 650-900nm(to be determined). My goal is to create a sensor that will be able to detect this emitted wavelength through...

I'm trying to build a device (using arduino) that will be able to determine the force applied to a small connection pin. The pin is lifted from the center with weight being applied to the ends. I'm trying to embed a sensor in the pin to measure the forces exerted on the pin. I have attached a...

Hi everyone, I'm working on a college project this year about mountain bike suspension damping. By trade I'm a mechanical engineer however, I'm required to construct a simple sensor circuit to monitor the performance of the damper I am making. Forgive me if my wording or logic is not quite...

The attached picture sums up my experiment. I used a slinky (a kind of a bouncing spring) to see the relationship between its maximum length when released and the length of its first rebound. However, I released the slinky using various different magnitudes of force. I used a sensor (a LabQuest...

Homework Statement A helicopter is flying at a constant altitude towing an airborn laser at 129kg. Both the chopper and the sensor move only horizontaly and have a acceleration of magnitude 2,84 m/s2. ignoring air restitance find the tension on the cable towing the sensor. Homework Equations...

what is reason for preferring platinum in micro-heater fabrication in the case of a gas sensor ? my understanding is that it is because of its stability in different chemical environments. Please comment if there are any other reasons

Back up and running; got these last weekend. 400/2.8, 50 minutes total integration time, 10s ISO 2000 individual frames. 800/5.6, 14 minutes total, 6s ISO 2000 individual frames. It's been an adjustment to the new sensor, my alignment technique had to improve by about 2x to eliminate...

I'm currently building a robot using Lego Mindstorm with an ev3 brick that will follow a pre-determined path (marked by black tape), maintain a certain distance behind another robot, and coming to a stop at the end of its journey. The ev3 will be connected to 2 DC motors, 3 light sensors, and an...

I need to indentify this type of sensor. Need to work in dark. Need to scan only in x axis. ( not to have angle in y-axis only in x ) Something like a plate. And needs to react when movement is changed in that plate.

Not sure if this is an engineering or physics question, but here it goes: I'm trying to wrap my head around the pressure field caused by waves. I'll recap to so anyone can check if I have made any incorrect assumptions: If we ignore atmospheric pressure, the pressure in the water has a...

Homework Statement I am using the a hall effect sensor - model 480-5198-ND. I have tested this simple circuit using a LED and it is working. However, it is "ON" by default. Only when the magnet is near the hall effect sensor , it will be "OFF". How do I make it such that it is OFF by default...

In this video , he shows the basic of hall effect sensor. At the video 1:46 , he shows the latch effect of hall effect sensor. Does this latch comes with the hall effect sensor? What I mean is built into the chip? or he did something to it? This is not a homework or assignment question. I am...

How can we detect whether a home window or door is opened or closed using sensors. I know it can be done using proximity sensors and window sensors. I want to know all possible ways/sensors to detect it. I am no way related to physics so please try to answer considering that :) Thanks in advance.

Homework Statement We have a sensor onboard a satellite that is faced towards Earth, from the Sun. The LW absorptivity is 0.8 (a_LW) and SW is 0.2 (a_SW). I need to find a equation for the temperature as a function of time. Given datas is the Area=0.3 m^2 and Specific Heat of 4 J/K Homework...

Hi, I am retired and work with computer programming as hobby. I wanted to find a way to connect a sensor to my laptop so that I could write a program for it. Example: reading atmospheric radiation levels with some type of sensor connected to my USB port. Could you direct me as to how, or...

Ok, if I have a transceiver circuit comprised of a RFID(with antenna-resonating to RFS) that has the capability of tag-tag communication and the RFID responds to a beacon signal from a RF source by transmitting in response to the beacon signal 2 (alive signal). Its electrically connected so as...

HI.. This is my first post here. I want calibrate RTD sensors so I am planning to buy Temperature calibrators includes three instruments with individual reference senors for three different set points(-ve, and two positive points). I am planning to calibrate RTD sensor by these three...

I've taken a year out of university to work at a design company and they have given me a project to design/make a test rig which measures the position of a metal shaft within an actuator assembly to check if its within a +/- 0.2mm tolerance. Some of the key requirements are: No contact with...

I am making a science fair project, I need to know how much power a general weight censor needs, google doesn't seem to be helping. And when a weight censor starts consuming energy?? when a certain weight is applied on it and it switches a circuit on, or as long as the weight censor remains...

Are ultrasonic , touch, colour sensors type of tactile sensor? I have been told not to use tactile sensor in my project. Can anyone name few sensors that are tactile and others which are non-tactile?

Hello all, The root problem is that I can't put all my analogue inputs onto one input card (each card has 4 inputs) on the project I'm working on. We have four sensors, they should all output 4-20mA. Two are source type outputs, supply voltage goes in, sensor current comes out, current is...

I am designing a circuit, in this simple circuit, when a weight isn't applied, the switch will go off and the circuit won't work until a certain weight is applied, how can i design it?? i am totally new and doing this for a science club, i have never designed any circuits with censor. so please...

Hello, Every member: We need to IR sensor solution for our system. Please, connect to me If you know any company of product or maker about the IR sensor. Required specifications are as follows: (ps: choose one of the following five.) 1. Thermopile array #1: a. Pixel pitch: 0.6 mm b. Array...

Dear Everyone, I'm searching for some specific elements for infrared (IR) sensor, such as Thermopile, Pyroelectric, Bolometer, MCT(HgCdTe), PbSe, or InSb sensors. Does anyone know how to get these kinds of elements ? ( I need some information about the manufacturers...) The elements are...

Homework Statement How can I calculate the resolution of a pressure sensor used to measure hight ( altimeter ) ? We have barometirc equation ( refer to http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/barfor.html#c3 ) , and I can't find out the solution. Can the resolution be the same as...

Hi After removing high frequency white noise in my INS sensor, I want to simulate low frequency noise with Burg or Yuler. I used some functions in python to analyse the recorded data and to get parameters to use. But the the problem is the sequences generated diverge (and take very big...

Hi I'm using accelerometer & horizontal gyroscope in order to replace GPS. Now, I'want to model the noise with first order markov process, to use it in kalman filter. I recorded measurement on all axes and computed auto-correlation. This picture represents auto-correlation on one of axes...

Assume that I have a light bulb with luminous emittance of 160000lux (16ev), and a gray wall with luminous emittance of 300lux (7ev). I take the photo of this bulb and this background. Is there any approximate formula to estimate the gray level or RGB value of the bulb and the background in the...

Hi all, I just hear from a friend that in carburetored cars there are still O2 sensors (not all cars). I not sure the purpose of O2 sensor in this case. Could anyone help ? Thanks

Hi I've been searching for a CMOS or CCD sensor with raw analog output and external reset/transfer control but has not been able to find this. Doesn't have to be great resolution. Anyone knows if there is a sensor like this on the market today? Best Johan

I am curious as to roughly how many photons strike a camera sensor (e.g. a DSLR) in dim light, where the camera can form an image? Also how many photons are hitting a photosite for it to be triggered? and... how many photons have to hit a human rod (or cone) cell for it to be triggered and...

Hey there, I want to build a simple temperature sensor using a BJT (BC547, 2N2222, or similar). I'm not sure how should I do that. My first thoughts where: measuring the Vbe, using around 9v to 12v as Vcc, the transistor with common-emitter; then just wrap the transistor in plastic or...

Purpose: Create a position sensor using LEDs. Goal: Increase or decrease a pulse width in response to direction of movement. Chips Involved: 1) Clock. 2) 2x DM74150 (16×1 Multiplexers.) 3) 2x SN74193 (4-bit Binary Counters.) 4) 1x SN74LS112 (Negative Edge Master Slave JK Flip-Flop.) 5) 1x...

Why is a slab of semiconductor used instead of just a basic resistor. The charge would be pushed to either side by the magnetic field in the same way, would it not?

I'm working on a little arduino-like project that involves a motion detector with customizable sensitivity. The ambition here is that I could get a PIR sensor wired up that would give an analog-esque output depending on how much motion it detects. I know standard PIR sensors have a...

Hello, I'm looking to try to use a gyroscope to determine the rocking motion (just side to side - not back and forth) of a boat while it is traveling forward or sitting still in the water. Specifically, I'm looking for the boat's angle from vertical and this angle's velocity. Can I do this...

Good day, TiO2 have many possible application in material science, one of this is in Memory device, base on some literature TiO2 had a good chemical stability at high temp, so this is one reason why TiO2 is best candidate for this application, but beside of that, what other properties of TiO2...

Hello, For my Master's Project, we are to choose an IMU module to stabilize a platform. You can think of a servo actuated turret, mounted on a Stewart Platform(which will generate the disturbances). The angular position error should be very low and there are both high and low frequency...

Hi guys, I have read a lot about car's MAP sensor and it's function but there are some areas that are not completely understood yet! Let me put it this way: My car's MAP sensor reads 337 mbar (millibar) @ idle (800 RPM). When i open the throttle, the reading DROPS (for example at 2500 RPM it...

Hi! I'm searching for an application for iPhone, similar to the Android App "Physics Toolkit Light Sensor", so I can use my iPhone as a light sensor. Does anybody know if there's such an app in the App Store? I'm not able to find one. Best regards Lasse

I am trying to estimate a current which I can get from the photodiode in a simple proximity sensor application having a IR LED emitter and a photo-diode detector. The LED and the photodiode are mounted in the same plane, on a PCB board, and separated about 10mm. If I have a flat Lambertian...

Okay I have a question involving calculating the FFT of a signal from a sensor. I have simulated many different scenarios in MATLAB of various noise characteristics involving the signal. I want to take the FFT of a noisy signal. As long as my expected input signal has a higher amplitude than...

Hello, I am a new member. I have some question concerning data acquisition on a torque sensor and I hope someone can help me out. I have a torque sensor that I use to mesure the torque and speed of a motor. The torque sensor outputs an analog signal of +/-5V (torque) and two digital signals...

I am looking for way how to do relative calibration of light sensor (PMT). I would appreciate any suggestions or links to sources with description how to do it in very simple (understand also cheap if possible) way. For example. Let say that I have integration sphere with two outpust. I have...

I'm designing an experiment in which I have to detect the forces exerted by alpha particles on a gold foil as they travel through it and are deflected by it. The forces I'm trying to detect range between 50-500 dynes and last approximately 10^-17 seconds. There should be several hundred of these...

Homework Statement Please see he attached file for the problem text. Homework Equations The output ##y(t) = h(t) * x(t)##, where ##h(t)## is the system's impulse response while ##x(t)## is the input signal. Laplace transformed, the formula above turns into ## Y(s)=H(s) \cdot X(s)##, where...

Hello .. This is part of a bigger project, what i need basically is a small and light sensor (programmable if possible) to be attached to a flying drone, the drone has to be able to detect tin cans from a distance - soft drink cans for example?