Questions tagged [sensors]

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8
votes
1answer
128 views

How can I estimate blocking window distance in an sCMOS sensor setup?

I am trying to establish an appropriate distance between a spectrograph output window and a CMOS sensor. The spectrograph creates a focused image on the CMOS sensor but I am trying to restrict the ...
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117 views

Schematic Reading - Fluid Control Limit Switch Question

Does limit switch LS1 remain pressed on until the piston moves to LS2?
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0answers
685 views

Conversion from LSB to mg not making sense for accelerometer

I have a BMI088 and am trying to get an accelerometer reading. The data sheet and specs for Bosch Sensortec are here: The sensitivity per range is this (its a 16 bit signed integer): ± 3 g: 10920 ...
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0answers
25 views

Predictive object tracking with 2 IMUs and a stereo camera

I am quite new to this so please forgive me for any mistakes. I am working on a simulation project and have very little clue as to what to do and I hope someone can point me to the right direction. ...
3
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0answers
156 views

How to tune the radial mode vibration of a PZT disc transducer?

I am trying to create a set-up where I can radially vibrate a 1x1 cm sample using a piezoelectric disc transducer. I know that at the $f_{min}$ of a PZT transducer, for the disc geometry, there is a ...
2
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0answers
22 views

allan-variance noise terms of MEMS accelerometer

Specific noise terms are given in datasheets of MEMS sensors. In example the specification of accelerometer contains information about random walk and in some cases the bias instability. Both ...
2
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0answers
98 views

What is meant by “accuracy within factor of 2” in sensors?

I've spent quite some time googling the meaning of "factor of (number)" in sensor accuracy but could not find any document explaining the meaning of this expression used to describe sensor accuracy. ...
2
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0answers
36 views

What is the gel used for covering the strain gauge in the load cell?

We have one imported strain gauge load cell, which shown open circuit in the input impedance. I removed the protective gel and corrected the wiring. Now the load cell is working. But I want to cover ...
2
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0answers
59 views

How to compare two acceleration sensors side-by-side?

I have a single axis analog capacitive acceleration sensor (from PCB Piezotronics) which is very reliable but expensive. Now I need more axis, unfortunately can not afford buying anymore. So I have ...
2
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0answers
40 views

Oxygen sensors in trace gas environments

Do Oxygen lambda sensors (used in automotive applications) work in trace gas environments? My requirements for a trace Oxygen gas sensor: The sensor must be capable of working in an inert gas ...
2
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0answers
47 views

Placement of a refractory wall excess temperature sensor?

I am working on a burner management system for a gas/coal fired pulp dryer. We are providing a thermocouple temperature switch on the roof of the firebox for an Excess Temperature Limit Interlock (per ...
2
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0answers
42 views

Convergence problem in polymer - silicon structural analysis

I'm trying to model a capacitive force sensor with a bilayer configuration of polymer - Si on Mechanical APDL 16.2 . I have a 0.2 mm layer of Si deposited on 0.005 mm of polyimide polymer. My goal is ...
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0answers
21 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 ...
1
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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 ...
1
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0answers
25 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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0answers
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 ...
1
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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 ...
1
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1answer
33 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 ...
1
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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
423 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): ...
1
vote
1answer
98 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
51 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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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
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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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
507 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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0answers
25 views

Detecting goals blocked on a foosball table

I am trying to find a way to detect when a goal is blocked on a foosball/kicker table. I have a HD camera above the table and a laser sensor built into each goal. The lasers can detect when a goal is ...
0
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0answers
36 views

What is the feedback signal used in the speed control of a brushless DC motor?

In a brush-less DC (BLDC) motor the commonly used speed is sensed using the feedback from Hall effect sensors and the back or counter EMF. The linked article on Wikipedia also mentions that 'Other ...
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0answers
29 views

Clarifications on the calibration of a magnetometer?

I've been reading up on magnetometer calibration (sensor fusion in general) recently and got confused about some things. To my understanding, hard iron effects (e.g. inductors and magnets) which are ...
0
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1answer
20 views

Passive Infrared Sensors (PIR) spectrum and reflections

I have a common PIR occupancy sensor (Lutron MS-OPS5M-WH). I am trying to get the sensor to cover an irregular-shaped room. I could expand the field-of-view of the sensor to cover the whole room by ...
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0answers
30 views

Laser Tape Measures and Range Finders

Is there a technology in Laser Tape Measures which differs from the ones in Laser Range Finders (ToF or Triangulation)? It seems that Laser Tape Measures are less expensive than any Laser Range Finder ...
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0answers
20 views

How to sanitarily measure vacuum in milk?

I would like to measure the vacuum inside of a tube which will contain air and milk. A vacuum pump attached to the tube will maintain a vacuum of around 15 inHg. Are there inexpensive sensors I can ...
0
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0answers
26 views

How does the number of cycles for averaging in a lock-in amplifier relate to low-pass filtering and where do I set it?

Please forgive me if I ask too many questions at once or I am too much of a rookie. I want to understand the working-principle of lock-in amplifiers (LIAs). I understood the calculation that yields ...
0
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0answers
18 views

Is it possible to set up an ultrasonic range-finding system using a separate transmitter and receiver across 30m distance?

I need to set up a system capable of detecting the distance between an object moving further away and an anchor point. This object would be traveling through a slightly curved tunnel (of 1m diameter), ...
0
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1answer
59 views

Can I use loadcell for vibrating force measurement?

Is it possible to use a load cell to measure a force that is vibrating? The idea is to measure that force that is getting into the load cell in a sweep of frequencies and vibration is NOT a noise. ...
0
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0answers
29 views

Low accuracy current feedback measurement in motor control

Given a very low accuracy current sensor in a 3 phase inverter (in my case used for motor control) what is the best way to tackle the issue and keep reasonable performance and robustness at the same ...
0
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0answers
64 views

Making a machine to sort out old bolts, washers, nuts etc in workshop

I spend a lot of time in my workshop sorting out and putting back into their boxes bunches of screws, washers, nuts and other assorted niknaks and I want to make a machine to take this chore off my ...
0
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1answer
44 views

Need help with reverse engineering a sensor

I have a pressure/temperature sensor for a vehicle, which I decided to tear apart to see exactly how the sensor works. This sensor as designed by the manufacturer it is meant to be immersed in oil to ...
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0answers
25 views

How to design a method to estimate vx=speed in direction of swimming

We have a body that goes underwater (let's say a whale) with magnetometer and accelerometer data. I also have GPS, date, depth, pressure and temperature data. I want to know if there is any simple way ...
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0answers
18 views

What object characteristics may cause significant distance measurement deviations in Sharp optical sensors?

Not sure if this is the right place to ask this question, but anyways. I'm not very fond of circuits and stuff, but I've got a test question I really need to answer. The question is in the title, ...
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0answers
12 views

Will expanding metal disrupt my motion sensor?

I am trying to install a door motion sensor in a environment that will get very hot for our work. So the door could heat up to temperature of 150-200°F. We built the frames and door to handle the ...
0
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1answer
37 views

Typical IMU accelerations and angular velocities for lower limbs

Is there a dataset out there right now that shows the typical acceleration and angular velocity values for sensors attached to the thigh, shank, and feet for standard walking? Or literature/textbook ...
0
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1answer
75 views

Why are FBG sensors recalibrated every 10 years?

So, I am working with FBG sensors and I have read that those sensors need to be re-calibrated every 10 years to get accurate measurements. But no where on the internet (AFAIK) is it explained why ...
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0answers
24 views

How do cordless lawn mowers determine lawn density?

Some cordless lawn mowers have a feature that causes the motor to cut off when the mower is rolled over a driveway or over a section of lawn where the grass is very sparse. How does the mower sense ...
0
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2answers
106 views

Activating lights using a motion sensor?

I was wondering how I would configure some sort of setup to get lights like this turn on a timer once activated by a motion sensor. I want them to turn on for about 15 seconds and then turn off once ...
0
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2answers
96 views

Compensating for a magnet in a device with a magnetometer

I'm working on a device that relies on data from a magnetometer. Unfortunately, the device also needs to have a fairly powerful magnet on it. Given that the design is fairly flexible, and within ...
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0answers
51 views

Leakage detection system along the pipe

I want to design a leakage detection system along the pipeline that will use differences in pressure of flowing liquid (change in pressure between two points). Which sensor I should use?
-1
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1answer
40 views

What are the simplest available methods for monitoring pressure and airflow in a 22mm diameter pipe?

In the emergency case that more than one person must share a mechanical ventilator, the medical professionals lose per-patient monitoring of pressure and airflow. To that end, what are the simplest ...