A Capacitive Fringing Field Sensor Design for Moisture Measurement Based on Printed Circuit Board Technology

Dean, Robert N.; Rane, Aditi; Baginski, M.E.; Richard, Jonathan T.; Hartzog, Zane; Elton, David J.

doi:10.1109/tim.2011.2173041

Cited by 111 publications

(56 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Active coatings applied to these devices allow detection of moisture, gases, and other substances [1][2]. The measurement of dielectric properties of insulating and semi-insulating materials also provides indirect information about their moisture content [3] and physical properties such as density [4], viscosity [5], porosity [6], and thickness [7]. By designing the electrodes such that the penetration depth can be varied, interdigital devices may in principle be used for three-dimensional imaging, but one difficulty in this regard is the non-uniform distribution of the fringing electric field, which is challenging to model.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the coplanar interdigital capacitive sensor

Huang¹,

Zheng²,

Bowler³

2017

AIP Conference Proceedings

View full text Add to dashboard Cite

Parallel double-plate capacitive proximity sensor modelling based on effective theory AIP Advances 4, 027119 (2014) Abstract. Interdigital capacitive sensors are applied in nondestructive testing and material property characterization of lowconductivity materials. The sensor performance is typically described based on the penetration depth of the electric field into the sample material, the sensor signal strength and its sensitivity. These factors all depend on the geometry and material properties of the sensor and sample. In this paper, a detailed analysis is provided, through finite element simulations, of the ways in which the sensor's geometrical parameters affect its performance. The geometrical parameters include the number of digits forming the interdigital electrodes and the ratio of digit width to their separation. In addition, the influence of the presence or absence of a metal backplane on the sample is analyzed. Further, the effects of sensor substrate thickness and material on signal strength are studied. The results of the analysis show that it is necessary to take into account a trade-off between the desired sensitivity and penetration depth when designing the sensor. Parametric equations are presented to assist the sensor designer or nondestructive evaluation specialist in optimizing the design of a capacitive sensor.

show abstract

Section: Introductionmentioning

confidence: 99%

Optimization of the coplanar interdigital capacitive sensor

Huang¹,

Zheng²,

Bowler³

2017

AIP Conference Proceedings

View full text Add to dashboard Cite

show abstract

“…In this paper the measurements characterize the SMP carbohydrates. The test cell has buried interdigitated electrodes which produce electric fringe-fields that penetrate the sample [6]. The SMP was characterized using a Gamry Ref 600 Impedance Spectrometer measures the samples' impedance magnitude, |Z| and the phase angle, θ, at selected frequencies f. Measured values were acquired between 1 MHz and 0.01 Hz with five-points per decade.…”

Section: Methodsmentioning

confidence: 99%

Using Dielectric Relaxation Spectroscopy to Characterize the Glass Transition and Onset of Crystallinity of Skim-Milk Powder

Mg¹

2018

Preprint

View full text Add to dashboard Cite

This paper describes the dielectric relaxation spectroscopy (DRS) method for obtaining glass transition temperature and the onset of crystallinity of skim milk powder (SMP). The methodology consists of exposing SMP samples to numerous constant temperatures, T, and water activities, aw, and measuring the relaxation time. Measurements are based on changes in the loss-tangent height at its peak frequency. Glass transition times are identified at peaks in the loss-tangent height versus time curve and the onset of crystallinity times are identified when the loss-tangent height collapses. The analysis leads to two boundary curves: glass transition Tg, aw curve and the onset of crystallinity Tc, aw curve. They separate the SMP stable (long shelf life) and unstable (short shelf life) regions. Two curve fitting algorithms were developed for (a) aw 2 , tg curve where tg is the time to glass transition and aw 2 , tc curve where time tc is the time to onset of crystallinity and (b) Tg, aw and Tc, aw boundary curves. Finally, the DRS data are compared to differential scanning calorimetry (DSC) results.

show abstract

“…Pada beberapa implementasi, elektroda sumber sinyal merupakan kanal untuk memberikan sinyal masukan yang nantinya akan dipancarkan dalam material uji hingga sinyal tersebut ditangkap oleh elektroda penerima. Jenis elektroda penerima memiliki potensial lebih rendah jika dibandingkan dengan elektroda pemancar dan pada umumnya adalah berpotensial nol (ground) [11]. Gambar 2.…”

Section: Model Sensor Interdigital Capacitorunclassified

“…Morfologi sistem interdigital capacitor (IDC-S). [11] Nilai kapasitan pada sistem IDC-S ditentukan oleh beberapa parameter fisis, meliputi faktor geometri, permitivitas bahan penyusun dan pola sinyal listrik. Medan listrik yang memancar dari masing-masing elektroda akan membentuk struktur kapasitor di sekitar elektroda.…”

Section: Model Sensor Interdigital Capacitorunclassified

See 1 more Smart Citation

Akuisisi Data Sensor Interdigital Capacitor Untuk Pengukuran Kadar Air Pada Batu Bata Berbasis Non-Destructive Testing

Albanna

2016

Media Komunikasi Teknologi

View full text Add to dashboard Cite

Interdigital sensor capacitor (IDC-S) is a sensor-based non-destructive testing (NDT), which is able to change the value of physical parameters into electrical quantity (capacitance). The design of the sensor IDC-S in this research ABSTRAKSensor Interdigital capacitor (IDC-S) merupakan sensor berbasis non-destructive tes (NDT) yang mampu mengubah nilai parameter fisis menjadi besaran elektrik (kapasitansi). Perancangan sensor IDC-S dalam penelitian ini berfungsi sebagai unit pengukur kadar air dalam batu bata hasil produksi. Tujuan umum dari penelitian ini adalah melakukan akuisisi data dari model sensor IDC-S dalam implementasi pengukuran kadar air. Air merupakan meterial yang memiliki nilai dielektrik. Interaksi bahan dielektrik dan medan listrik yang ditransmisikan oleh elektroda coplanar sensor IDC-S akan mampu mengubah nilai kapasitansi. Tahap pertama dalam penelitian adalah simulasi numerik FEM sensor IDC-S menggunakan perangkat lunak Agros2D. Hasil simulasi menunjukkan distribusi potensial hanya berada pada sekitar elektroda. Pada kontur simulasi tidak terdapat overlap potensial antar elektroda. Proses pengujian dilakukan dengan dua metode yaitu statis dan dinamis. Pada metode pengujian statis dilakukan pengukuran nilai kapasitansi terhadap variasi kadar air. Pengukuran kapasitasni dalam metode statis dilakukan dengan instrumentasi standar RCL Meter PM 6303A Phillip-Fluke. Didapatkan data nilai kapasitansi sekitar 8.2 pF -45.5 pF (kadar air 0% -70%). Metode kedua adalah pengukuran nlai kapasitan dengan memanfaatkan sinyal kotak. Hasil analisa fungsi eksponensial dari sinyal luaran yang terukur didapatkan besar kapasitan adalah 9.4 pF-43.9 pF. Nilai pengukuran kapasitansi pada metode dinamis dipengarui oleh beberapa derau frekuensi rendah yang teridentifikasi melaui FFT spectrume analyzer SR770. Diharapkan sensor IDC-S dapat diimplementasikan dalam pengukuran kadar air batu bata berbasis NDT.

show abstract

A Capacitive Fringing Field Sensor Design for Moisture Measurement Based on Printed Circuit Board Technology

Cited by 111 publications

References 21 publications

Optimization of the coplanar interdigital capacitive sensor

Optimization of the coplanar interdigital capacitive sensor

Using Dielectric Relaxation Spectroscopy to Characterize the Glass Transition and Onset of Crystallinity of Skim-Milk Powder

Akuisisi Data Sensor Interdigital Capacitor Untuk Pengukuran Kadar Air Pada Batu Bata Berbasis Non-Destructive Testing

Contact Info

Product

Resources

About