I am working in project with FSR using Velostat material. i need some clarification about this product mentioned below.
product link - https://www.adafruit.com/product/1361
1. Force Range of velostat material
2. Pressure Range of velostat material
3. Force vs resistance table
4. Pressure vs resistance table
5. how to Calibrate sensor with Velostat
Specification of VELOSTAT product - 1361
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- adafruit_support_bill
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Re: Specification of VELOSTAT product - 1361
Unfortunately, there are no manufacturer specifications for those properties since Velostat is not designed as a force sensitive material. Velostat (also Linqstat and similar) are designed and marketed as antistatic packaging materials. So the specifications and manufacturing process controls are tailored for those purposes.
The force sensitive properties are a side effect of the material composition (a carbon-loaded polymer) since the material tends to become more conductive when compressed. However, this property is not relevant to the the intended purpose, so it is not controlled in manufacturing and may vary considerably between samples of the material.
The force sensitive properties and the relative low-cost of the material have made it popular among hobbyists for fabricating low-cost DIY pressure sensors. But due to the variability in the force sensitivity, sensors must be individually calibrated.
The force sensitive properties are a side effect of the material composition (a carbon-loaded polymer) since the material tends to become more conductive when compressed. However, this property is not relevant to the the intended purpose, so it is not controlled in manufacturing and may vary considerably between samples of the material.
The force sensitive properties and the relative low-cost of the material have made it popular among hobbyists for fabricating low-cost DIY pressure sensors. But due to the variability in the force sensitivity, sensors must be individually calibrated.
- askmani
- Posts: 3
- Joined: Mon Feb 07, 2022 1:42 pm
Re: Specification of VELOSTAT product - 1361
Thanks for you response,
Can you please tell me that if there is any way to provide maximum capable of force/pressure it can hold?
Can you please tell me that if there is any way to provide maximum capable of force/pressure it can hold?
- adafruit_support_bill
- Posts: 88089
- Joined: Sat Feb 07, 2009 10:11 am
Re: Specification of VELOSTAT product - 1361
The maximum measurable load would be determined partly by the sensitivity of the material and partly by the design of your sensor. Given a sample of the material with a specific sensitivity, a sensor design which distributes the compressive force over a larger area will be capable of measuring higher forces than one with a smaller area. All else being equal, a 2x2 sensor would have 4x the load capacity of a 1x1 sensor. Since the material is available in sheet form, it is possible to fabricate very large sensors.
- adafruit_support_bill
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Re: Specification of VELOSTAT product - 1361
This paper investigates some of the electrical properties of the material when used for pressure sensing:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7761878/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7761878/
- askmani
- Posts: 3
- Joined: Mon Feb 07, 2022 1:42 pm
Re: Specification of VELOSTAT product - 1361
thanks for your support
Please be positive and constructive with your questions and comments.