Questions tagged [sensors]

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3answers
162 views

How can I build a proximity sensor?

I want to build a proximity sensor that will detect if an object is within 100 cm of the sensor and then send a signal to a raspberry pi. What type of short range detection device should I use to ...
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1answer
376 views

Selecting the correct strain gauge and metal thickness for custom load cell

I'm working on project and after a good amount of research I've ended up with a final design that looks roughly like this: The design is inspired by load cells used in bathroom scales, but I found ...
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1answer
77 views

FFT output for noise sensor shifts after some time

I am using a noise sensor (ADMP401) along with Arduino Mega. I use FFT to convert the noise sensor analog output to frequency domain, then remove the first 30 bins (to remove some board noise), then ...
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1answer
65 views

Resistive force sensor: some basic questions about its functionality

I want to know what the circular force sensor outputs when it is connected to the breadboard (with resistor). Does it output force measured in grams? When I slightly touch the sensor with a finger, ...
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2answers
862 views

Short range distance estimation systems

Is there any emitter/receiver (passive or active) systems that allow distance estimation in the range of 1~2 meters with an accuracy of few centimetres and don't need to have a direct line of sight as ...
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1answer
147 views

What is the meaning of a “trip angle” in a level sensor?

What does trip angle mean in the context of slope / level sensors / inclinometers?
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1answer
149 views

From strain to displacement in 3d

I got a question thats been bugging me for a while: Say that you're given a straight square beam (say one meter long), and you attach three strain gauges on each face. One at 0 degrees, one at 45 ...
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0answers
24 views

Finding force distribution using accelerometer data

The team I'm currently working for is trying to compare bushings with different durometer ratings in the front suspension using single axis(z) accelerometer data during curb impacts. The current ...
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2answers
71 views

How is the YAW angle calculated by an IMU sensor?

Say a body rotates by 90 degrees, then the yaw angle will be 90 which can be calculated using the data provided by IMU. Now from that point, the body traverses some distance and is again rotated by 90 ...
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1answer
54 views

Ceramic pressure measurement - piezoelectrical or capacitive?

Context: I'm writing about an old industrial training facility used for a petrochemical process. In this training facility, there is a 3-phase separator. On that separator is a pressure measurement. ...
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0answers
23 views

Moisture sensor for Mixers

I'm looking for alternatives to measure the moisture content in a concrete mixer machine. The ones on the market are expensive, like Hidro-Mix for apparent reasons; mixers are a hostile environment ...
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0answers
17 views

Accurate distance sensor via soft materials

I'm trying to find a sensor that can measure distance between sensor and some sort of detectable material (metal or small wireless chip) size of no more than a penny. It should be able to measure ...
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0answers
27 views

How to choose order and cut-off frequency for low-pass Butterworth filter?

When using IMU data (accelerations and angular velocities), many papers use a 4th order low-pass butterworth filter with a cutoff frequency of 5 Hz. However, none of them really justify why those ...
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17 views

motion gesture and axis definition

I read something about defining hand gesture, which include mid-air hand gesture (e.g a peace sign with the two fingers moving one after another), touch-based gesture (e.g. on touch screen), and ...
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0answers
46 views

How much does loading a load cell in other directions than the direction it was designed for effect the readings?

I am looking into using this TAL230B miniature type load cell to measure forces in x and y direction. The normal sensor loading is displayed in image 1. What is the effect of loading them as in image ...
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1answer
56 views

How to create a Liquid tight cable seal in a fuel storage tank

I am working on a telemetry system where a liquid level sensor (Hydrostatic pressure sensor) is used to monitor the volume of fuel (gasoline / diesel) in an underground storage tank. The sensor has ...
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1answer
36 views

Weight Sensor module needed

I'm looking for a low-power weight sensor which can withstand impacts of up to 1000 pounds. Is there a go-to supplier or brand for this sort of product? I want it to give its output digitally; my end ...
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0answers
20 views

Referencing for Air Quality Monitoring

I asked the same question in electronics sub, but since it is more general I am asking it here again. I bought the Sharp dust sensor GP2Y1010AU0F. Below are the graph of readings indoor for ~5 minutes,...
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0answers
430 views

Build and visualize Pitch, Roll and Yaw from 9dof data offline

I am trying to build pitch, roll and yaw from sensor readings of a 9 degree of freedom sensing device. The data look like that (in a .csv file): ...
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1answer
99 views

Which type of sensors to analyze polluting gas from vehicle emissions

I am thinking to develop a remote-sensing applications for vehicle pollutions. In such cases generally expensive optical IR and UV devices are used because more precise. These devices are generally ...
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0answers
52 views

How to calculate slope/tilt from IMU

I have to calculate the slope/tilt from a 6 axis (3D Accelero, 3D Gyro) IMU. Are there open source libraries that help one do this or should I build it on my own? How do I get started? Is there an ...
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0answers
68 views

Could we use NE 555 Timer for industrial magnetic proximity switching circuit?

I actually need a magnetic proximity switching circuit such that In the case of water in fuel sensor, whenever the water level in water in fuel sensor increases the magnetic float shall move and come ...
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0answers
60 views

Commercial electric motor with integrated torque sensor and torque control [closed]

Are there any commercial solutions for electric rotary motors with integrated torque sensor and torque control? I'm only aware of www.sensodrive.de which are essentially the drives used in the DLR/...
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0answers
53 views

Is there a 5% range CO sensor with a response rate higher than 1Hz?

I'm building a portable emission analyser which measures emissions from a tailpipe, to aid in troubleshooting and tuning an engine. For this, I need a $\text{CO}_{2}$ , a $\text{CO}$, and an $\text{O}...
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1answer
687 views

Multi Ratio Current Transformers

I encountered a problem in measuring electrical energy using a multi ratio current transformer (CT). The catalogue of CTs is unavailable. I have little information about the type of CT I am using. I ...
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0answers
91 views

Flex sensor vs stretch sensor [closed]

I want to use sensor for stretchable or bendable movements on knees, on fabric. But I am confused that which sensor is better to use and why?
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0answers
60 views

What is the relation between frequency of piezo element and its shape?

I was reading about piezo elements and its frequency. I found on the internet that : The composition of the ceramic material and the shape and volume of the element determine the resonance frequency ...
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0answers
510 views

Deriving relationship between LVDT and mass spring damper

I have this system below. It is the schematic of a linear accelerometer moving horizontally, where $m$ is the total mass of the slide, $b$ denotes the viscous damping, and $k$ represents the spring ...
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1answer
176 views

What is meant by the terms “low pass sensor” and “band pass sensor” in a course syllabus?

I am doing B.E. in Mechatronics Engineering. I am due to take a subject called 'Sensors and instrumentation'. So far I only have the syllabus for the course. I decided to do some reading in advance of ...
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2answers
70 views

What is the name and purpose of this Instrumentation / Mechanical fitting

The component I am interested in is the blue "head" in the attached image. I call it the sensor head but will like to know if it has a specific industry name
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2answers
33 views

What attributes of a surface are relevant to light sensors? [closed]

I'm doing a study on surfaces and I would like to describe all of the surfaces that I expect to encounter in the field and determine which ones will be the most difficult to detect. To do this, I need ...
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2answers
69 views

Is there a way to determine the colour information of light emitted from an LED?

Say you have an LED light that emits green light. Are there sensors out there that could accurately determine the colour information of the green light? Such as the relative values of red, blue and ...
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2answers
27 views

Are cameras' CCDs just elaborate tiny solar cells?

While watching How It's Made episode on CCDs, this just springed to my mind... I always though of CCDs as of some kind of alien technology. Only now I realized that it's just an array of silica ...
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2answers
282 views

How do I sense reflective tape such as on a spinning wheel?

I know that the frequency and rotational speed of a spinning shaft or wheel is measured using a device that senses a piece of reflective tape on one of the rotating components. I am thinking a laser ...
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1answer
28 views

Do LiDAR sensors generate point cloud data from a single collection or build them up over multiple collections?

I am currently writing a background section on lidar sensing for part of my dissertation. I have either confused myself or not thought on the topic enough and I am attempting to gain a clearer ...
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1answer
32 views

Orientation of wire in linear position wire sensors

Talking about a wire potentiometer, I was wondering about the way it could be used after installation. as you know, wire sensors have a roll of wire inside them that come out of a hole, and it sounds ...
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1answer
40 views

How can I confirm nL Volume Measurement for Pump and Sensor Calibration

I'm dispensing around 1uL of volume with 1% accuracy. Although I'm confident in my pump, I'd like to be able to routinely confirm that I'm getting the exact volume I'm requesting every time. How can ...
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1answer
22 views

Contact Motion Analysis (CMA) [closed]

In this solution Helicoptor Fire Control System CMA is used. For motion analysis we use computer vision and image processing. But what is special about CMA.
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2answers
75 views

High impact force sensor?

I have a small table-like platform with two legs. Underneath each, I need to measure the amount of force. I want to use the difference between the two force measurements to estimate the platform's ...
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1answer
333 views

Strain gauge placement to measure a twisting beam

Where is it best to place a strain gauge to measure the twist of a beam? And what type of gauge is best? In my application, I have a small metal part which experiences a twisting and bending force. ...
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2answers
426 views

how to implement autofocus for video projector

I have a modified pico video projector that I need to add an autofocus to. The focusing ring already has a fast stepper motor added to it. If the focus had to be done on the middle of the projection ...
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1answer
59 views

Low power, large weight sensor needed

I am looking for a weight sensor which has a range from 2000 kg to 30000 kg to measure the weight of passing trucks. Accuracy is not very important. Power use is very important, typically 3.3v. Do ...
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2answers
287 views

How to measure above 100K RPM?

I'm trying to measure the rotational speed of a turbocharger, but the laser tachometer I have can only measure up to 99,999 RPM and it isn't enough (display starts to output letters) and devices that ...
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2answers
47 views

Determining change of object over time ( diameter )

I am currently attempting to solve the following problem. Say that I have an object that can expand and contract, given some external force. What I want to know is how much it has expanded, or ...
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1answer
39 views

How to turn a photo receptive sensor into an emitter of light? [closed]

I try to understand how is possible to turn a photo receptive sensor into an emitter of light. Settings, tools, modulation..
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1answer
39 views

Infrared thermometer unreliable [closed]

I have an infrared thermometer that supposedly goes up to 1200F (https://www.amazon.com/gp/product/B00IT0ODPQ/ref=oh_aui_search_detailpage?ie=UTF8&psc=1). However, I used this on my electric ...
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2answers
733 views

How reliable is a QR code reader?

I'm currently designing a project for a local museum through Purdue University's engineering class. My team has come down to three options: Trying on a space suit with functioning parts Looking ...
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2answers
85 views

Is there any good way to measure humidity constantly in a concrete block?

So, there is this teacher who wants to test how an chemical compound acts in the velocity of drying in concrete. Basically, i want to measure continuously (it would be great if i could do it with an ...
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1answer
194 views

Px26-015 pressure sensors output

I had a PC Mountable Wet/Wet Differential Pressure Sensor I used it to measure a pressure difference , I don't know how to convert its output to pressure !
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24 views

motion tracking (or position tracking) with tilting

I'm looking for a sensor or a tool for tracking motion on a surface similar to Ultrasound probe, for a relatively small movement, about less than 30cm, and it needs to be able to tilt. standard ...