Keeratirawee, Kanchalar

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Keeratirawee, Kanchalar
Alternative Name
Keeratirawee, K.
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Email
kanchalar.ke@kmitl.ac.th

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    Determination of Binary Gas Mixtures by Measuring the Resonance Frequency in a Piezoelectric Tube
    (2022-02-01)
    Keeratirawee, Kanchalar
    ;
    Hauser, Peter C.
    The composition of gas mixtures may be determined via changes of the speed of sound. As this affects the resonance frequency of the gas inside a tube, indirect measurements through a frequency analysis are also possible. It is demonstrated that this may be carried out with unprecedented simplicity by the novel employment of a piezoelectric tube which serves at the same time as a resonance tube and as transducer into the electronic domain. Experiments were run using a simple diecast aluminum box as the measuring cell, inside which the piezoelectric tube made from lead zirconium titanate with 30-mm length and 5.35-mm inner diameter was suspended. A small loudspeaker placed into the cell served for excitation of the resonance. Peak frequencies between 3910 and 14,590 Hz (for pure CO<inf>2</inf> and He, respectively) were obtained. Two component mixtures of O<inf>2</inf>/N<inf>2</inf>, CO<inf>2</inf>/N<inf>2</inf>, and He/N<inf>2</inf> at various composition were tested. A linear frequency change from 4790 to 5100 Hz was observed when going from pure O<inf>2</inf> to pure N<inf>2</inf> .
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    Photoacoustic detection of ozone with a red laser diode
    (2021-02-01)
    Keeratirawee, Kanchalar
    ;
    Hauser, Peter C.
    The photoacoustic detection of ozone using the Chappuis band is demonstrated. A visible red laser diode emitting at 638 nm was employed as a light source. The photoacoustic cell consisted of a conventional resonance tube with a MEMS (microelectromechanical systems) microphone placed outside an opening along the tube. A calibration curve for the range from 33 ppmV to 215 ppmV was found to be highly linear with a coefficient of determination (r<sup>2</sup>) of 0.9999, when allowing for different measurement frequencies to account for shifts in the speed of sound due to changes in the gas matrix. The limit of detection was found to be 1.6 ppmV for an optical power of the laser diode of about 130 mW.
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    Low-cost electronic circuitry for photoacoustic gas sensing
    (2022-04-01)
    Keeratirawee, Kanchalar
    ;
    Furter, Jasmine S.
    ;
    Hauser, Peter C.
    The circuitry comprises a sine wave generator based on direct digital synthesis, a laser diode driver module, a band-pass frequency filter, a synchronous detector with phase adjustment circuitry and a low pass filter to form an analog lock-in amplifier, and an analog-to-digital converter. A 32-bit ARM microcontroller programmed with the open source Mecrisp dialect of the Forth interpreter language is used to set the frequency, and read the data from the analog-to-digital converter. The circuitry is tethered via a serial interface to a personal computer. A graphical user interface written in Phython allows easy interaction with the microcontroller by sending the appropriate Forth commands. The data acquired is visualized and stored on the personal computer for further processing. The circuitry is easy to build as it is based on through-hole devices, except for two necessary surface mount items, which, however, still can be soldered with a fine tipped soldering iron. The performance of the circuitry was demonstrated by the photoacoustic detection of NO<inf>2</inf> using a laser diode with a wavelength of 450 nm.
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    Piezoelectric tube as resonant transducer for gas-phase photoacoustics
    (2021-02-22)
    Keeratirawee, Kanchalar
    ;
    Hauser, Peter C.
    The use of a piezoelectric tube for the photoacoustic gas-phase determination of NO<inf>2</inf> as a model analyte is demonstrated. The tube is made from lead zirconate titanate with 30 mm length and 5.35 mm internal diameter. Its inner and outer surfaces are coated with electrodes. The tube serves as both, resonance body and transducer. The design is thus simpler than the usual combination of resonance tube and microphone as the two functions are embodied in the same component. The main resonance frequency of the tube was found to be 5341 Hz. A blue laser diode emitting at 450 nm was employed as light source for the determination of NO<inf>2</inf>. The limit of detection was determined as 83 ppbV and the calibration curve was linear with a coefficient of determination (r<sup>2</sup>) of 0.9998 up to the highest concentration of 15 ppmV tested.