Simultaneous Display of Spectral Images and Graphs Using a Web Camera and Fiber-Optic Spectrophotometer

Niece, Brian K.; Lourigan, Gary A.

doi:10.1021/ed083p761

Cited by 3 publications

(4 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The development of experiments and methods of instruction in spectrophotometry has been the focus of educational literature over many of the past decades, with articles describing the construction of bespoke spectrophotometers, 15,16 investigation of path length, 17 and the observation of diffraction, 18 polarizers, 19 and display of spectra. 20 Pedagogical activities relating to the conceptual development of absorbance 21 or transmittance 22 are commonly treated in the educational literature. For example, Gordon and Harman 21 described an activity using a graduated cylinder to modulate the path length of a permanganate solution to qualitatively and quantitatively describe the relationships of path length, absorbance, and concentration.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Although fundamental to the understanding of such analysis, instruction on the underlying three physical phenomena of reflectance, transmittance, and absorbance may be overlooked in the process of achieving learning outcomes related to the quantification of unknown concentrations. The development of experiments and methods of instruction in spectrophotometry has been the focus of educational literature over many of the past decades, with articles describing the construction of bespoke spectrophotometers, , investigation of path length, and the observation of diffraction, polarizers, and display of spectra …”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Activity for Examining Light Reflectance, Transmittance, and Absorbance with Textiles and Light-Emitting Diodes

Heider,

Stucki,

Hill

et al. 2024

J. Chem. Educ.

View full text Add to dashboard Cite

Recent research has demonstrated the unambiguous positive effects of active learning in a variety of college-level courses. We report the implementation and assessment of a 50 minute active-learning in-class activity to conceptualize light absorbance, reflectance, and transmittance, coupled with a writing-to-learn exercise. The activity is suitable in a classroom setting using portable hand-held sensors and samples, including textiles and food-dye solutions. The assessment of the activity included a quasi-experimental design, in which 116 students in an introductory university chemistry course completed the activity, with outcomes compared to a different section, including 322 students, without the active-learning exercise. To determine the efficacy of the activity, students' written reports and exam assessment items relating to reflectance, transmittance, and absorbance were evaluated. With the assessment questions showing statistically significant improvement, it was concluded that the hands-on activity was effective in helping the students better understand the relationships among the three properties of light.

show abstract

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Activity for Examining Light Reflectance, Transmittance, and Absorbance with Textiles and Light-Emitting Diodes

Heider,

Stucki,

Hill

et al. 2024

J. Chem. Educ.

View full text Add to dashboard Cite

show abstract

“…Technological advances have made devices like emission and absorption spectrometers more portable and affordable, providing opportunities to incorporate these techniques into large classes which would not have been previously feasible. While portable and comparatively inexpensive absorption spectrometers have been broadly available for several years, atomic emission can now be studied using simple emission spectrometers, studying atomic line spectra and continuous spectra from several lamp sources − and from a series of flame tests. ,− Absorption studies can be carried out using simple spectrometers, allowing for the comparison between absorption and emission instrumental techniques.…”

Section: Introductionmentioning

confidence: 99%

Exploring Emission and Absorption Spectroscopy in the First-Year General Chemistry Laboratory

et al. 2020

View full text Add to dashboard Cite

In the first-year general chemistry laboratory course, instrumental data collection involving sample quantification has often been limited to absorption spectroscopy due to the inaccessibility of emission techniques suitable for large enrollments and novice users. In this laboratory experiment, students explore the complementary techniques of emission and absorption spectroscopy, in which sample quantification respectively occurs via the measurement of light emitted or absorbed by the sample. Calibration curves are constructed for both techniques. Eschewing atomic absorption spectroscopy (AAS) and inductively coupled plasma atomic emission spectroscopy (ICP-AES), instrumentation not typically available for large general chemistry courses, quantitative data is instead collected using a series of carefully implemented flame tests. Students perform flame tests on alkali, alkaline earth, and transition metal compounds using the emitted light to gain a thorough understanding of emission spectroscopy. In Week 1, students are introduced to emission spectroscopy through the identification of unknown components in air, lamps, and contaminated soil samples. In Week 2, students carry out quantitative emission and absorption characterization of Na and Cu solutions, comparing the two techniques through experimental observations and analyzed results. Calibration curves with high linear regressions (r 2 > 0.992) are prepared and used to determine the concentrations of provided reference samples, with averaged student data resulting in reasonably low percent errors (<12% for Na emission, <11% for Cu emission, and <2% for Cu absorption) when compared to the known concentrations. Students then compare experimental flame emission results to provided ICP data to gain experience with a sensitive, quantitative emission technique.

show abstract

“…Hence, various educational tools have been developed to observe spectra at the secondary-school level (1)(2)(3)(4)(5)(6). In tertiary education, CCD array spectrophotometers, or fiber-optic spectrophotometers, have been recently recognized as useful tools at undergraduate level (7)(8)(9)(10)(11). This kind of spectrophotometer is easy-to-use and gives UV-vis spectral charts readily and instantly.…”

mentioning

confidence: 99%

Resolving Spectral Lines with a Periscope-Type DVD Spectroscope

Wakabayashi

2008

J. Chem. Educ.

View full text Add to dashboard Cite

A new type of DVD spectroscope, the periscope type, is described and the numerical analysis of the observed emission and absorption spectra is demonstrated. A small and thin mirror is put inside and an eighth part of a DVD is used as a grating. Using this improved DVD spectroscope, one can observe and photograph visible spectra more easily and clearly than with an earlier design. The spectra photographed using a digital camera were digitized using a software that is available from a free public source and were numerically analyzed using a conventional spreadsheet. Spectral charts of the emission spectra of a fluorescent lamp, discharge lamps of hydrogen and helium, sunlight, Na flame test, and the absorption spectrum of KMnO4 aqueous solution are reported. Small features are discernible in the spectra. For the sun spectrum, many Fraunhofer lines were clearly observed and some of the lines are assigned to Na, H, Fe, Mg, and Ca elements. For the Na flame test, the D line was clearly resolved to two distinct peaks at 589.0 and 589.6 nm when a pair of razor blades was used as a slit. Those results show that this periscope-type DVD spectroscope has the potential to be a cost-effective, powerful, and versatile tool for science education.

show abstract

Simultaneous Display of Spectral Images and Graphs Using a Web Camera and Fiber-Optic Spectrophotometer

Cited by 3 publications

References 30 publications

Activity for Examining Light Reflectance, Transmittance, and Absorbance with Textiles and Light-Emitting Diodes

Activity for Examining Light Reflectance, Transmittance, and Absorbance with Textiles and Light-Emitting Diodes

Exploring Emission and Absorption Spectroscopy in the First-Year General Chemistry Laboratory

Resolving Spectral Lines with a Periscope-Type DVD Spectroscope

Contact Info

Product

Resources

About