Posted in | Pressure Sensors

Pressure Sensing and Tactile Grip Force

The Grip™ system allows users to measure static and dynamic pressure from grasping objects. This device measures the pressure of a human hand while holding (or gripping) an object, allowing for further design, comfort and ergonomics.

It can be used to enable a more ergonomically-sound product, as well as improve the analysis of tools and sports equipment. The application can also be used in medicine, providing a useful tool in research (for example, in the study of carpal tunnel and repetitive motion syndrome). Therefore, the Grip™ is the perfect tool for recording and understanding data to improve product design, manufacturing, ergonomic quality, and research.

Key Features

  • Simultaneous measurement of left and right hands
  • Multiple independent sensing elements which enable precise measurement of pressure points at a local level
  • Flexibility. For example, one subject will be able to grip objects in different ways
  • High scanning rates of up to 750 Hz (tethered version)

Sensor

  • Sensor form factor allows for a full range of hand motion
  • The paper-thin sensor does not affect the grip "feel"
  • One size fits all
  • Durable and reusable

There are three hardware options for the grip system: Tethered, Wireless and Datalogger.

Grip wireless for bat grip evaluation

Configurations

The Grip™ System is offered as either tethered or untethered to improve mobility and the range of recording. Which setup a user will need will depend on the intended application.

Tethered Model

Tethered Model

Cuffs are unique scanning electronics that are utilized in every VersaTek™ based system. While connected to the sensor, the Cuffs collect, process and transfer data to the computer via the USB connection.

VersaTek electronics process information at the fastest rates and can be integrated with other VersaTek sensors, giving users the flexibility to add other features, such as in-shoe, prosthetic, grip, and seating & positioning capabilities to their Tekscan System.

Setup Components Description
Grip Tethered

  • VersaTek Cuff(s)
  • VersaTek 2-Port Hub
  • Grip Software CD
  • Sensor(s), Model# 4256E
The sensor and scanning electronics on the hands are connected to the computer by wires using a USB port. This device has a scan rate of up to 750 Hz.
Grip Wireless

  • VersaTek Cuff
  • VersaTek 2-Port Hub
  • Grip Software CD
  • Sensor(s), Model# 4256E
  • Wireless Unit
The transmission of data is taken directly from the hand to the computer with no wires, making it suitable for a number of different applications. The device has a range of 100 meters and data is measured and displayed on the computer instantaneously. A 100 Hz scan rate is offered with wireless connectivity.
Grip Datal​ogger

  • VersaTek Cuff
  • VersaTek 2-Port Hub
  • Grip Software CD
  • Sensor(s), Model# 4256E
  • Datalogger
  • 8 GB Memory Card
There is an internal memory in the device which stores the sensor data until it is ready for uploading to a computer. This device is ideal for applications where the subject must be at a greater distance than 100 meters from the computer (for example when measurements need to be taken over a long period of time). This device can achieve scan rates of up to 750 Hz.
Grip Wireless/Datalogger
  • VersaTek Cuff
  • VersaTek 2-Port Hub
  • Grip Software CD
  • Sensor(s), Model# 4256E
  • Wireless Unit
  • Datalogger
  • 8 GB Memory Card
Wireless and Datalogger performance is supported by the Hub.

 

Sensors

The Grip™ System can be used directly on a hand or integrated within a glove thanks to the thin, high-resolution sensors that are used. To use the device, parts of the hand (or hands) being measured will be fitted with as many as eighteen sensor regions.

Gaps between sensors have been incorporated into the design to allow participants to move their joints naturally and avoid influencing the grip data that is collected. Sensels™ are a collection of sensing elements that constitute each sensing region and enable different pressure points on the hand to be identified and localized.

Grip Sensor Model 4256E

Grip Sensor Model 4256E

Software

The Grip™ system software has a number of key benefits:

  • Multiple graph options to plot data
  • Access real-time or recorded data in 2D & 3D
  • Export data to ASCII or AVI files
  • Key metrics: total force, peak pressures, and center of force
  • View and compare multiple test results simultaneously
  • Ability to attach a digital image to each frame of a Tekscan movie
  • The software is available in several languages, including Spanish, French, and German.

Example of grip pressure data while subject operated an industrial floor polisher.

Example of grip pressure data while subject operated an industrial floor polisher.

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