Presentation Title

Methodology for Error Reduction

Faculty Mentor

Mark Boryta, Robert Nelson, Kenneth Manatt

Start Date

17-11-2018 12:30 PM

End Date

17-11-2018 2:30 PM

Location

CREVELING 108

Session

POSTER 2

Type of Presentation

Poster

Subject Area

physical_mathematical_sciences

Abstract

Prior research performed by Mt. San Antonio College and the Planetary Science Institute (Nelson et al., 2018 : Boyrta et al., 2017 ) concerning the reflectance and polarization properties of particulate materials such as Aluminum Oxide and silica spheres revealed the potential for their use as aerosols toward the temporary mitigation of some of the effects of climate change. In order to quantify the reflectance properties (and therefore usefulness) of potential sample materials, it is necessary to establish a standard for the reflectance measurements we would record in our experiments. To this end, we docllected data on a set of standard reflectance materials and evaluated methods of Maximizing the signal to noise in our measurements in order to provide a baseline for future comparison.

We tested two methods that involved measuring the intensity of light reflected from illuminated samples and amplified by a photomultiplier tube (PMT) . These methods were: 1) comparing the measurements made with the PMT at room temperature (23 deg C) with those made at -10 deg Cel, and 2) comparing different durations of the recording intervals. A third method (mounting samples on a spinning motor in order to average the error created by an imperfect surface) was also used to decrease error, but was not tested for effectiveness using a control of a non-spinning mount. We found that both decreasing PMT temperature and increasing recording duration are effective in improving the signal-to-noise in the resulting data.

Summary of research results to be presented

From our analysis of our results we conclude that the method of lowering the temperature of the photomultiplier tube is effective in decreasing error from thermal noise and providing more accurate data.

Additionally our method of increasing the measurement interval for each voltage setting is also effective in providing more accurate readings.

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Nov 17th, 12:30 PM Nov 17th, 2:30 PM

Methodology for Error Reduction

CREVELING 108

Prior research performed by Mt. San Antonio College and the Planetary Science Institute (Nelson et al., 2018 : Boyrta et al., 2017 ) concerning the reflectance and polarization properties of particulate materials such as Aluminum Oxide and silica spheres revealed the potential for their use as aerosols toward the temporary mitigation of some of the effects of climate change. In order to quantify the reflectance properties (and therefore usefulness) of potential sample materials, it is necessary to establish a standard for the reflectance measurements we would record in our experiments. To this end, we docllected data on a set of standard reflectance materials and evaluated methods of Maximizing the signal to noise in our measurements in order to provide a baseline for future comparison.

We tested two methods that involved measuring the intensity of light reflected from illuminated samples and amplified by a photomultiplier tube (PMT) . These methods were: 1) comparing the measurements made with the PMT at room temperature (23 deg C) with those made at -10 deg Cel, and 2) comparing different durations of the recording intervals. A third method (mounting samples on a spinning motor in order to average the error created by an imperfect surface) was also used to decrease error, but was not tested for effectiveness using a control of a non-spinning mount. We found that both decreasing PMT temperature and increasing recording duration are effective in improving the signal-to-noise in the resulting data.