Data was collected using a custom LabVIEW program (NI USB-6009 DAQ) to simultaneously record input from the force transducer and IMP sensors. The gauge pressure in each passive trial was adjusted so baseline was at zero for the length of Lo and normalized by the maximum pressure for each sensor, referred to as relative pressure as a percentage of maximum. Similarly, force was adjusted at Lo and normalized by the maximum force. Similarly, force was shifted to zero at Lo and normalized by the maximum force. The peak force was identified and corresponding pressures from the two sensors were found at each muscle length. Active force/IMP data was not the focus of data processing, as the study goal was to mimic tendon transfer surgeries in humans, where only passive force is evaluated and no muscle activation occurs. The effects of muscle activation have been reported previously by Davis et al (2003) (link) and Winters et al (2009) (link).
Ni usb 6009 daq
Manufactured by National Instruments
Sourced in United States
The NI USB-6009 is a low-cost, multifunction data acquisition (DAQ) device that connects to a computer via USB. It provides analog input, analog output, and digital I/O functionality for basic measurement and control applications.
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3 protocols using ni usb 6009 daq
1
Passive Muscle Force and Pressure Monitoring
2
Ethanol Vapor Sensing with Figaro TGS 2620
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Figaro TGS 2620 Organic Solvent Vapor Sensor [powered by a 5V DC voltage from an Arduino (Adafruit)] was used to monitor the relative concentration of ethanol vapors in the air. To prevent extended contact of odor-laced air with the sensor, the head cap of the sensor was removed. Paired PID and alcohol sensor recordings were then conducted ∼10–15 mm downstream of an odor port releasing ethanol vapors from a tube controlled by a valve (Clippard EV-2-12). The PID and sensor recordings were digitized by NI USB-6009 DAQ (National Instruments) at a sampling frequency of 500 Hz. The data acquisition and valve control were conducted through custom scripts written in LabView (National Instruments). For recordings in a dynamic plume, paired recordings were conducted downwind of an ethanol port in a custom-designed arena (see Results section) at multiple locations. Data from locations near the port, near the middle of the arena, and farthest downwind were pooled.
3
Amplification and Noise Reduction in Sensor Measurements
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