Questions tagged [sensors]

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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 ...
1
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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 ...
3
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1answer
741 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
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 ...
8
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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 ...
2
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2answers
58 views

Measuring distance to a non perpendicular surface

I am a Mechanical engineering student and i am completely new to arduino and need some advice. i have a project to measure the maximum deflection in a sailplane wing (up to 9 meters) How do i measure ...
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
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 ...
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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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1answer
63 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. ...
2
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2answers
62 views

How can one make the beam angle smaller on an ultrasonic sensor?

I'm trying to create higher resolution data with a beam angle of 5> degrees (as close as 1 degree as possible). I have been experimenting with creating using an aluminum casing around the sensor ...
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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 ...
2
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1answer
633 views

Can lamda sensor 4.9 be used without the special LSU-IC?

I was looking into using Lambda Sensor LSU 4.9 to know the lambda value. From the datasheet, its looks though this sensors cannot be used without a special IC such as Bosch lambdatronic LT4. Can we ...
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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 ...
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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
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 ...
4
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1answer
47 views

Is there an industry consensus standard for storing sensor data?

I would like to know what standard(s) may exist for formatting log data from sensors that record information such as: temperature pressure humidity vibration acceleration vector magnetic field vector ...
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
76 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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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 ...
7
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3answers
8k views

What is Radial and Thickness Mode Vibration in a Piezo Electric Ceramic Disc Transducer?

I am trying to use a Piezo Electric Ceramic Disc Transducer for ultrasonic sensing measurements for fluid levels. A Piezo Ceramic Disc with a Resonant frequency of 215 KHz or 1 MHz is under ...
0
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1answer
21 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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5answers
2k views

Low cost, moderately accurate water depth measurement

tl;dr: After an extended conversation with an old-timer, I realized a few things: The single most valuable measurement for the majority of people will be water-depth-in-well. The second most valuable ...
0
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1answer
39 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 ...
1
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2answers
70 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 ...
1
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1answer
20 views

Sensor compatibility with power source

I have a sensor whose datasheet mentions that it should be connected to 5V Vcc. A green LED glows on the sensor when it is powered from the source at 5V. However, even if I power it with 3.3V, still ...
0
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1answer
26 views

Complementary filter in MPU_6050 is giving me the wrong answer when the system is accelerating

So I am using a complementary filter to find the attitude in my quadcopter, doing the following $$\text{angle} = 0.98\cdot (\text{angle}+\text{dt}\cdot \text{angle_rate})+0.02\cdot \text{...
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0answers
31 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 ...
0
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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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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 ...
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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 ...
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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
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
26 views

Schematic of a resettable thermostat

You can put 2 or 4 or even 6 pcs of this in series to make sure at least one will work or open if it reaches say 55 degree celsius, right? And there is no resistances to consider when its close and in ...
1
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1answer
166 views

What are some robust method to detect or repel lizard?

I am working on a HVAC project where lizard in going inside the electrical unit and causing wire damage and short circuit. I need to find some solution to detect or repel lizard before any ...
2
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0answers
25 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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3answers
1k views

How to test connectivity between wire and piezo-ceramic transducer

I have mounted a piezo-ceramic ultrasonic transducer (MODEL # SMD10T2R111WL, Vendor Website: PIEZO CERAMIC DISC 10X2MM R 215 KHZ WIRE LEADS) under a plastic tank using epoxy. Please see the below ...
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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?
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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 ...
2
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5answers
128 views

What sensors/methods can be used from the roadside to determine if a truck is loaded or empty - without weighing it?

What sensor, using what physical principle, can penetrate a closed rectangular object like the trailer of a truck and tell if the space is empty or loaded? Why is this question relevant? One of the ...
2
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0answers
109 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. ...
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2answers
48 views

How do fiber optic sensors detect strains in a structure?

I am working on a project on detecting damage in structures using fiber optic sensors. I read the paper Structural Health Monitoring in Composite Structures by Fiber-Optic Sensors and found out that ...
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0answers
66 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 ...
3
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2answers
42 views

H2 Sensor in N2 environment

We develop a test station where we might have H2 leakage. To prevent explosion we are considering intertisation using N2 gas (primary explosion protection). However we also want to detect leakage ...
2
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1answer
173 views

Can a load be estimated using a Kalman filter?

I have a system with a motor, some masses, damping and springs. One of the masses is loaded with an unknown external force F. I want to estimate the force F using data of the motor (mainly current). ...
2
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1answer
70 views

Kalman filter for sensor fusion — what is the advantage?

Is there any meaning of using Kalman Filter for cases when you do not have good statistical model of the system? For example, if you have a drone and it has IMU sensor and GPS sensor. You do not have ...
1
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1answer
33 views

Design of a hydrogen and corrosion sensor query

I’m designing a hydrogen and corrosion sensor. A thin film changes resistance based on hydrogen concentration. Then the capacitance between two electrodes will change depending on substrate thickness (...
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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 ...
1
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1answer
91 views

How to reduce oscillations (rapid changes of control signal) when controlling a real system, which occur due to noise in measurement from sensors?

I have a real mechanical system (ball & beam) which I want to control. The system is approximated by the second order transfer function: $$ T(s) = \frac{b_0}{s^2+a_1s+a_2} $$ and in state-space ...
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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 ...