Development of a Wireless, Battery-Free SAW Volatile Organic Compounds Sensor Integrated with Temperature Sensor

Lim, Chun-Bae; Wang, Wen; Yang, Sangsik; Lee, Keekeun

doi:10.1166/sl.2011.1424

Cited by 5 publications

(5 citation statements)

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“…In recent years, several SAW embodiments have been proposed for wireless, passive SAW sensors [ 17 , 18 ], and these may be practical for portable or wireless sensor networks (WSN). Numerous designers presented the option of integrating general WSN platforms with sensor devices for a variety of applications [ 19 , 20 , 21 ], and several wireless and passive SAW-based sensors have been used to detect organophosphorus compounds [ 22 ], CO 2 , NO 2 or humidity [ 23 , 24 , 25 ]. Several studies on wireless chemical sensors and algorithms for SAW sensors were reviewed [ 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

A Novel Surface Acoustic Wave Sensor Array Based on Wireless Communication Network

Pan¹,

Mu²,

Liu³

et al. 2018

Sensors

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A novel surface acoustic wave (SAW) sensor array based on wireless communication network is prepared. The array is composed of four SAW sensors, a wireless communication network module, and a global positioning system (GPS) module. The four SAW sensors of the array are coated with triethanolamine, polyepichlorohydrin, fluoroalcoholpolysiloxane, and L-glutamic acid hydrochloride to detect hydrogen sulfide (H2S), 2-chloroethyl ethyl sulfide (CEES), dimethylmethylphosphonate (DMMP), and ammonia (NH3) at film thicknesses of 50–100 nm. The wireless communication network module consists of an acquisition unit, a wireless control unit, and a microcontroller unit. By means of Zigbee and Lora technologies, the module receives and transmits the collected data to a PC work station in real-time; moreover, the module can control the sensor array’s working mode and monitor the working status. Simultaneously, the testing location is determined by the GPS module integrated into the SAW sensor array. H2S, CEES, DMMP, and NH3 are detected in 300 m at different concentrations. Given the practical future application in environment in the future, the low, safe concentrations of 1.08, 0.59, 0.10, and 5.02 ppm for H2S, CEES, DMMP, and NH3, respectively, are detected at the lowest concentration, and the sensitivities of different sensors of the sensor array are 32.4, 14.9, 78.1 and 22.6 Hz/ppm, respectively. With the obtained fingerprints and pattern recognition technology, the detected gases can be recognized.

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Section: Introductionmentioning

confidence: 99%

A Novel Surface Acoustic Wave Sensor Array Based on Wireless Communication Network

Pan¹,

Mu²,

Liu³

et al. 2018

Sensors

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“…proposed some passive SAW-based sensors for wirelessly sensing some toxic or harmful gases like CO 2 , NO 2 , and some other volatile organic compounds, where the phase signal from the reflectors of the SAW reflective delay line configuration induced by the gas adsorption between the sensitive interface and target gas was picked for gas sensing. Clear sensor responses were observed in wireless measurements [ 13 , 14 , 15 , 16 ]. Lieberzeit et al .…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, target OC concentrations can be extracted by evaluating the differential phase signals, Φ sensor , as Φ sensor = 2 × π × f × (Δτ 32 − w × Δτ 21 ), where f is the operation sensor frequency, Δτ 32 and Δτ 21 are the measured changes in time delays among the three reflection peaks from the peaks including the information of environmental temperature and target species concentration, and w is the ratio of the second-to-third reflector distance to the first-to-second reflector distance [ 13 ]. It is obvious that the proposed chemical sensor presents many advantages: The sensor chip is maintenance-free because it is passive, and does not require any power supply to operate; The working environment can be very hazardous such as contaminated and high voltage areas because of the wireless measurement; Temperature compensation can be accomplished well by using the sensor chip design through the differential method [ 13 , 14 , 15 ]. …”

Section: Introductionmentioning

confidence: 99%

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Development of a Wireless and Passive SAW-Based Chemical Sensor for Organophosphorous Compound Detection

Wang

Xue

et al. 2015

Sensors

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A new wireless and passive surface acoustic wave (SAW)-based chemical sensor for organophosphorous compound (OC) detection is presented. A 434 MHz reflective delay line configuration composed by single phase unidirectional transducers (SPUDTs) and three shorted reflectors was fabricated on YZ LiNbO3 piezoelectric substrate as the sensor element. A thin fluoroalcoholpolysiloxane (SXFA) film acted as the sensitive interface deposited onto the SAW propagation path between the second and last reflectors of the SAW device. The first reflector was used for the temperature compensation utilizing the difference method. The adsorption between the SXFA and OC molecules modulates the SAW propagation, especially for the time delay of the SAW, hence, the phase shifts of the reflection peaks from the corresponding reflectors can be used to characterize the target OC. Prior to the sensor fabrication, the coupling of modes (COM) and perturbation theory were utilized to predict the SAW device performance and the gas adsorption. Referring to a frequency-modulated continuous wave (FMCW)-based reader unit, the developed SAW chemical sensor was wirelessly characterized in gas exposure experiments for dimethylmethylphosphonate (DMMP) detection. Sensor performance parameters such as phase sensitivity, repeatability, linearity, and temperature compensation were evaluated experimentally.

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“…The propagating Love wave is partially reflected by three shorted grating reflectors and a Au electrode on the top of the PMMA overlayer, reconverted into EM waves by SPUDTs, and transmitted to the network analyzer through the antenna. 15,16) Neuron firing to the Au electrode induces a change in electrical charge density, resulting in a velocity change in the Love wave flowing underneath the Au electrode. By evaluating the magnitude of the time shifts, the lingering time at that position, the cycle periods at the reflection peaks in the network analyzer, and all information regarding neuron firing can be extracted.…”

Section: Introductionmentioning

confidence: 99%

Battery-Free Love-Wave-Based Neural Probe and Its Wireless Characterizations

Jung

Lee

2013

Jpn. J. Appl. Phys.

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A wireless Love-wave-based neural probe that utilizes a one-port reflective delay line was developed for both reading and stimulating neurons in the brain. Poly(methyl methacrylate) (PMMA) as a waveguide layer and gold (Au) electrodes were structured on the top of a 41° YX LiNbO3 piezoelectric substrate, following the parameters extracted from coupling-of-mode (COM) modeling. For a one-port reflective delay line, single-phase unidirectional transducers (SPUDTs) and three shorted grating reflectors were employed, which made possible the implementation of a wireless and battery-free neural probe. The fabricated Love-wave-based neural probes were wirelessly measured using two antennas with a 440 MHz central frequency and a network analyzer. Sharp reflection peaks with a high signal-to-noise ratio were observed from the reflection peaks. The probe was immersed in 0.9% saline solution while applying input DC voltages. Good linearity, high sensitivity, and reproducibility were observed depending on DC applied voltage, in the range from 0 to 500 mV. The sensitivity obtained from the DC firings (artificial neural firings) was ∼0.04 µs/VDC, indicating that this prototype probe is very promising for the wireless reading and stimulation of neural firings in in vivo animal testing.

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Development of a Wireless, Battery-Free SAW Volatile Organic Compounds Sensor Integrated with Temperature Sensor

Cited by 5 publications

References 0 publications

A Novel Surface Acoustic Wave Sensor Array Based on Wireless Communication Network

A Novel Surface Acoustic Wave Sensor Array Based on Wireless Communication Network

Development of a Wireless and Passive SAW-Based Chemical Sensor for Organophosphorous Compound Detection

Battery-Free Love-Wave-Based Neural Probe and Its Wireless Characterizations

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