In this study, aimed to develop low-cost sensor based on fiber optic to assess ammonia index for fishpond application. Here, the simple design was proposed by using Evanescent wave type to assess ammonia index during acid rain event. The experiment result showed maximum absorption loss with variation ammonia mass 1~5% with wavelength 1310 nm from Optical Light Source (OLS) is 27.56 dBm while Optical Spectrum Analyzer (OSA) reached 25.86 dBm. We had calculated RMSE, MAE, and Percent Error (PE) value both of the device (Low-cost fiber optic chemical sensor and OSA) are 1.692%, 0.916%, and 98.833% respectively. A good result from low cost fiber optic chemical sensor has successful developed with lowest production less than 1,455 USD per-year.

Acid rain event is very dangerous for human activity especially in five cities of Indonesia. Here, acid rain has consistently attacked over five cities in Indonesia such as Jakarta, Manado, Pontianak, Bogor, and Surabaya with average pH level 4.22 to 6.34 in July 2010. Thus, in this study aim to develop Fiber Optic Chemical Sensor (FOCS) for monitoring acid rain level over five cities in Indonesia. The development of FOCS is used evanescent wave type and photodiode FDS10X10 to monitor acid rain quality. In this study, the Optical Power Meter (OPM) is used as a validator equipment to capture FOCS capability. The result shows absorption loss was successfully detected using OPM and photodiode FDS10X10 in FOCS evanescent wave type. Here, the maximum value ammonia mass over acid rain level has successfully detected with value range 7.12 dBm to 8.34 dBm and 7.51 dBm to 7.71 dBm using photodiode FDS10X10 and OPM, respectively. The good result over validation process shows FOCS has successful working with strong correlation 0.78 to monitor acid rain level.

Instructional media trainer of fiber optic sensor system is media that utilize optical fiber as props in the lessons sensors and actuators. The purpose of this research is the study of students learning outcomes on subjects sensor and actuator by use trainer fiber optic sensor system and student’s responds about media has used. The method used in this research is experimental design, with the pre-experimental design. This research was conducted in class XI technique electronics industry (TEI) 1 in SMKN 1 Katapang Bandung with 38 students. The research results show that there has been increasing study results students who demonstrated by the strengthening ( the gain ) study results students on the cognitive domain an average of 0,64 in the medium category. In the domain affective and in the domain psychomotor the average value on the good predicate. All of students gives a very positive responds about implementation of this media. From the results of this research can be stated that using fiber optic sensor system could improve student learning outcomes and students’s response is very positive to the media used. Thus we can conclude that fiber optic sensor system on the subjects of sensor and actuator can improve learning outcomes students and very use full to be used in vocational school.

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