• Home
  • About
  • Login
  • Register
  • Search
  • Archive
  • Announcements
  • Editorial Board
MAIN MENU
  • Home
  • About
  • Login
  • Register
  • Search
  • Current
  • Browse
  • Announcements
  • Submit
  • Editorial Board

MAGISTER SCIENTIAE

ABOUT THE JOURNAL
Authors Guidelines
Focus and Scope
Editorial Board
Reviewer
Open Access Policy
Publication Ethics
Peer Review Process
Announcements
Contact Us

Visitors (since November 13th, 2017):

 

View Magister Scientiae Stats
Flag Counter

About The Authors

Bergitta Dwi Annawati
Widya Mandala Surabaya Catholic University
Indonesia

Mitrayana Mitrayana

User
Journal Content

Browse
  • By Issue
  • By Author
  • By Title
  • Other Journals
Information
  • For Readers
  • For Authors
  • For Librarians
Keywords Early Childhood teachers, readiness and involvement, online learning English vocabulary, Quizlet, students’ attitudes ICT, ICT literacy, TPACK, English teaching, generation Z Intelligence Quotient (IQ), Emotional Quotient (EQ), Spiritual Quotient (SQ), Speaking Proficiency, Indonesian Adults. Speaking, Textbook, Content Feasibility causal-comparative cloze technique distance learning, early childhood, early childhood education teacher eleventh graders higher-order thinking intermediate listening junior high school language learning strategies, high achievers, low achievers online learning reading ability reading comprehension questions reading proficiency self-efficacy students’ perspectives writing self-efficacy young learners, speaking, role-play
Home > No 47 (2020) > Annawati

CO2 LASER POWER OPTIMIZATION OF PHOTOACOUSTIC SPECTROMETER AND IT’S APPLICATION TO DETECT AMMONIA GAS (NH 3 ) CONCENTRATION ON ISOTONIC BEVERAGE CONSUMER’S BREATH

Bergitta Dwi Annawati, Mitrayana Mitrayana

Abstract


Performance of photoacoustic spectrometer CO2 laser can be optimized by variation of laser voltage with active laser medium gas compositions include gases He, N2 and CO2. Characterization of photoacoustic spectrometer CO2 laser is done by determined resonance curve, quality factor, noise and lowest detection limit. Photoacoustic spectrometer applied to detect ammonia gas concentration in isotonic beverage. Photoacoustic spectrometer was applied to detect the concentration of ammonia in the isotonic drinks and measuring result using multicomponent-analysis. The lowest detection limit for ammonia gas on line 10R14 obtained at (70 ± 7)
ppb with highest laser power obtained at (37 ± 0.1) W and the composition of the active medium gas He, N2 and CO2 30:40:30. The highest concentration of ammonia gas, 0 minute in range of (2.89 ± 0.05) ppm, 30 minutes in range of (4.22 ± 0.05), 60 minutes in range of (5.34 ± 0.05), 120 minutes in range of (5.49 ± 0.05) ppm, 150 minutes in range of (3.62 ± 0.05) ppm and 180 minutes in range of (3.28 ± 0.05) ppm. Changes concentration of ammonia gas result are influenced by the length of time after consuming isotonic beverage.

Save to Mendeley


Full Text:

PDF


DOI: https://doi.org/10.33508/mgs.v1i47.2442
PUBLISHER
Faculty of Teacher Education
Jl. Kalijudan 37, Surabaya 60114
Email: magister-scientiae@ukwms.ac.id

Magister Scientiae is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License

ISSN: 2622-7959

Hosted by Mason Publishing, part of the George Mason University Libraries.