To mimic real guinea pig excrement, we designed an artificial pellet (4 × 9 mm in size and the surface area of the proximal and distal segments was 4.7 mm2, while that of the middle segment was 5.05 mm2) and attached it to the packaged sensor. The artificial pellet was made of polylactic acid and formed by 3-dimensional printing (Fig. 1A ). The proposed pressure sensor was designed with careful consideration of the structure and motility mechanism of the guinea pig large intestine. Three pressure sensors were mounted, one each on the proximal, middle, and distal portions of the artificial pellet, in order to provide some redundancy in the size and shape of the artificial guinea pig feces. The capacitance of a prototype sensor was recorded as 2.5–3.0 pF. This capacitance value was later converted to a count value using a lab-fabricated data conversion system. The sensitivity of the pressure sensor was recorded as below 1 mmHg per atmospheric pressure (Fig. 1B ). Finally, tests for the reproducibility and accuracy of measurements were done using an evaluation system (High precision pressure regulator CPC3000; Mensor San Marcos, Texas, USA), vacuum chamber, network analyzer (HP, 8753E; Palo Alto, CA, USA), and switch module (PXIe-1082; National Instruments; Austin, Texas, USA).
Pxie 1082
Manufactured by National Instruments
Sourced in United States
The PXIe-1082 is a 18-slot PXI Express chassis from National Instruments. It provides a modular and scalable platform for building custom test and measurement systems. The chassis supports PXI Express modules and incorporates features for high-performance data acquisition, signal generation, and instrument control applications.
Automatically generated - may contain errors
Lab products found in correlation
Spr 671, by ADInstruments (1 mentions)
Pxi 6133, by National Instruments (1 mentions)
Mdo3012, by Tektronix (1 mentions)
Tg165, by Teledyne (1 mentions)
Pxie 4330, by National Instruments (1 mentions)
Pxie 8135, by National Instruments (1 mentions)
Sr570, by Stanford Research Systems (1 mentions)
S 4800, by Hitachi (1 mentions)
D max2000, by Rigaku (1 mentions)
4 protocols using pxie 1082
1
Artificial Guinea Pig Feces Sensor
2
Blast Wave Exposure in Rats
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We arbitrarily assigned rats to whole-body or torso-only configuration groups (n = 8 each). We used isoflurane to anesthetize the animals. Subsequently, we exposed them to a single blast using their respective setups and shock tubes at the NJIT. We measured the static pressure–time profile of the blast wave at distances of 2946 and 2692 mm from the membranes for whole-body and torso-only exposures, respectively, using a pressure sensor (model 134A24; PCB Piezotronics, Depew, NY) with its probe oriented parallel to the flow of the blast wave. We measured the intracranial pressure at the lateral ventricle and the intravascular pressure at the carotid artery using Millar pressure catheters (models SPR-407 and SPR-671, respectively, ADInstruments). In the torso-only configuration setup, the intracranial and carotid-artery pressure sensors were located outside of the shock tube (Fig. 1 B, right). We implanted the sensors following the approach described in our previous study12 (link). For data acquisition, we used a custom LabVIEW code running on a multifunction data acquisition module (model PXI-6133; National Instruments, Austin, TX) and a PXI chassis (model PXIe-1082; National Instruments). We recorded the data at a sampling frequency of 1.0 MHz.
3
Characterization of PDMS Nanocomposite TENGs
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The surface tension of the sacrificial solvents was measured using a surface tension analyzer (DST-60, SEO Co.). To visualize and measure temperature, a thermographic camera (TG-165, FLIR Co.) was used. The microstructure was characterized using field-emission scanning electron microscope (FE-SEM: S-4800, Hitachi Co.). To determine the physical form of the PDMS nanocomposites, X-ray diffraction (XRD: D/Max-2000, Rigaku Co.) analysis was performed. An in-house motorized system controlled via LabVIEW was used to test the TENGs. The contact force of the TENGs was measured using a load cell (UMM-K20, Dacell Co.). The applied contact force was recorded through a data acquisition board (PXIe-4330, National Instruments Co.) mounted on a PXI chassis with a controller (PXIe-8135 and PXIe-1082, National Instruments Co.). For all evaluation of TENGs, the applied force and frequency were fixed to 6 N and 2 Hz, respectively. An oscilloscope (MDO-3012, Tektronix Co.) and a preamplifier (SR570, Stanford Research Systems Co.) were used to measure voltage and current, respectively.
4
Reconfigurable Metasurface Wireless Communication
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The experimental configuration is illustrated in Fig. 5a for confirming the ability of harmonic generations and manipulations with the proposed scheme. A linearly polarized transmitting horn antenna is used to excite the ASTCM sample. The ASTCM sample is controlled by a commercial platform (PXIe-1082, NI Corp.) consisting of a high-speed I/O bus controller, an FPGA module, a digital-analog conversion module, a DC power supply module, and a timing module, which enables us to provide high-quality biasing signals on the embedded varactor diodes in the metasurface. A microwave signal generator (Keysight E8267D) is connected to the antenna and provides a single frequency signal at 4.25 GHz. Two receiving antennas are placed behind the transmitting antenna to record echo waves from the metasurface with a software-defined radio transceiver (NI USRP RIO 2943 R), and receive two data streams during the wireless communication experiments. The distance between the metasurface and receiving antennas is 1.2 m.
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