Topic
Flame detector
About: Flame detector is a research topic. Over the lifetime, 794 publications have been published within this topic receiving 4344 citations.
Papers published on a yearly basis
1 / 2
Papers
TL;DR: In this article, a pulsed flame photometer detector (PFPD) design with improved performance is described, and the effect of the pulsed nature of the PFPD on the chromatographic peak area and height reproducibility is modeled and analyzed.
Abstract: A new pulsed flame photometer detector (PFPD) design is described with improved performance. Detection limits of 180 fg/s (sulfur), 7 fg/s (phosphorus), and 2 pg/s (nitrogen) are demonstrated when 2 rms noise is considered as the detection 1imit. The minimum detected amount of sulfur was further reduced with a sulfur doping method to about 30 fg/s. The factors affecting the selectivity are analyzed in terms of operating the PFPD as a specific detector without any hydrocarbon interferences. The effect of the pulsed nature of the PFPD on the chromatographic peak area and height reproducibility is modeled and analyzed. It is shown that above 3 Hz, the standard deviation of peak area is 2%, which is dominated by nondetector effects. The detector temperature effect was studied and is presented. The difference between light guide and lens optics is discussed. The column operation with hydrogen as a carrier gas is compared to that with helium, and the injection of chlorinated and fluorinated solvents is shown and discussed. New ways of obtaining additional information by using the added dimension of time are analyzed. It is shown how the simultaneous use of dual gates can provide unambiguous heteroatom identification. It is also described how a dual gate subtraction method results in a considerable enhancement of the interheteroatom selectivity, especially for phosphorus versus sulfur. The dual gate approach also provides up to an order of magnitude increase in the measurement dynamic range. Practical utilization of the PFPD is illustrated with the analysis of real-world samples, including thiophene in benzene, pesticides in a broccoli extract, and a sulfur-containing drug in human serum.
103 citations
TL;DR: A method based on solid-phase microextraction and gas chromatography flame photometric detector for the determination of organophosphorous pesticides in aqueous samples was described and 100 mum PDMS and 85 mum PA were the most sensitive fiber coatings for the analytes.
101 citations
TL;DR: In this paper, the authors have fabricated n-Al 0.44 Ga 0.56 N/p-GaN heterojunction photodiodes with a cut-off wavelength of 275 nm.
Abstract: We have fabricated n-Al 0.44 Ga 0.56 N/i-Al 0.44 Ga 0.56 N/p-GaN heterojunction photodiodes with a cut-off wavelength of 275 nm. The multilayer device structure was grown by metal-organic vapor phase epitaxy using a low-temperature interlayer technique. Thanks to the high quality AIGaN, the responsivity dropped steeply by three, five and six orders of magnitude at the AIGaN bandedge of 275 nm, 600 nm, and 1 μm, respectively. The steep bandedge enables a minimum leakage of effective weak-flame luminescence between 250 and 280 nm. For flame detection, a visible cut-off filter to assist the selectivity to the flame luminescence was attached. In addition, the photodiode was operated at zero-bias so that the darkcurrent does not exceed the weak photocurrent induced by flame luminescence. This solar-blind photosensor thus successfully responded selectively to the flame luminescence regardless of whether the room was lighted or not.
69 citations
Patent•
20 Nov 1985TL;DR: In this paper, a plurality of light-taking optical fibers are arranged so as to provide different directions of fields of vision at their front ends, and even if the primary combustion zone moves back and forth with respect to the tip of the burner due to the change in load, the flame can be accurately detected providing high reliability.
Abstract: In a flame detector having an optical head, a plurality of light-taking optical fibers are arranged so as to provide different directions of fields of vision at their front ends. Therefore, the watching regions of burner flame has been widened, and even if the primary combustion zone moves back and forth with respect to the tip of the burner due to the change in load, the flame can be accurately detected providing high reliability. Junction optical fibers and wiring optical fibers are separately provided in addition to the light-taking optical fibers. Therefore, when one or more optical fibers are damaged, only the damaged optical fibers are required to be replaced with new ones providing cost reduction in maintenance. Two or more photosensitive elements having different sensitive wavelength regions are used. Therefore, various types of flames having various wavelengths can be effectively detected providing wider detection range when compared with conventional apparatus.
62 citations
54 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2021 | 8 |
| 2020 | 21 |
| 2019 | 27 |
| 2018 | 33 |
| 2017 | 33 |
| 2016 | 37 |