ANALISIS ASPEK ERGONOMI PADA LINGKUNGAN KERJA (STUDI KASUS PADA UNIT PRODUKSI COCO FIBER)

Temperature, noise and lighting are the most problems faced by industries, especially at the Coco fiber production company. The objectives of this research were to evaluate the working environment factors such as temperature, noise, and lighting. This research was conducted at the Coco fiber production company namely CV Tiga Sehati at Ledokombo, Jember. Questionnaire was addressed to the workers in the processing area of company to get comments related to the working area. Discussion with key person was also implemented in this research to reach data. Direct measurement of working area environment was conducted using several tools such as thermometer, luxmeter and sound level meter. The average of temperature, humidity, noise and lighting were achieved at the level of 29.5oC, 62.9%, 88.9 dB and310.26 lux, respectively. Almost all of these results were higher than standard level. Some of working area improvement were strongly needed to keep safe, health and convenient of the workers.Keywords: ergonomic, work environment, coco fibe

Adaptive sampling dual terahertz comb spectroscopy using dual free-running femtosecond lasers

Terahertz (THz) dual comb spectroscopy (DCS) is a promising method for high-accuracy, high-resolution, broadband THz spectroscopy because the mode-resolved THz comb spectrum includes both broadband THz radiation and narrow-line CW-THz radiation characteristics. In addition, all frequency modes of a THz comb can be phase-locked to a microwave frequency standard, providing excellent traceability. However, the need for stabilization of dual femtosecond lasers has often hindered its wide use. To overcome this limitation, here we have demonstrated adaptive-sampling THz-DCS, allowing the use of free-running femtosecond lasers. To correct the fluctuation of the time and frequency scales caused by the laser timing jitter, an adaptive sampling clock is generated by dual THz-comb-referenced spectrum analysers and is used for a timing clock signal in a data acquisition board. The results not only indicated the successful implementation of THz-DCS with free-running lasers but also showed that this configuration outperforms standard THz-DCS with stabilized lasers due to the slight jitter remained in the stabilized lasers

Development of a wavefront sensor for terahertz pulses

Wavefront characterization of terahertz pulses is essential to optimize far-field intensity distribution of time-domain (imaging) spectrometers or increase the peak power of intense terahertz sources. In this paper, we report on the wavefront measurement of terahertz pulses using a Hartmann sensor associated with a 2D electro-optic imaging system composed of a ZnTe crystal and a CMOS camera. We quantitatively determined the deformations of planar and converging spherical wavefronts using the modal Zernike reconstruction least-squares method. Associated with deformable mirrors, the sensor will also open the route to terahertz adaptive optics

Direct Wavefront Measurement of Terahertz Pulses Using Two-Dimensional Electro-Optic Imaging

We report on the development of a wavefront sensor for terahertz pulses using a direct two-dimensional electro-optic imaging system composed of a ZnTe crystal and a CMOS camera. By measuring the phase variation of the terahertz electric field in the crystal plane, we are able to reconstruct the terahertz (THz) wavefront in order to determine the optical aberrations of the optical system. Associated with deformable mirrors or specifically designed optics, the sensor will open the route to terahertz adaptive optics

Direct Wavefront Measurement of Terahertz Pulses Using Two-Dimensional Electro-Optic Imaging

We report on the development of a wavefront sensor for terahertz pulses using a direct two-dimensional electro-optic imaging system composed of a ZnTe crystal and a CMOS camera. By measuring the phase variation of the terahertz electric field in the crystal plane, we are able to reconstruct the terahertz (THz) wavefront in order to determine the optical aberrations of the optical system. Associated with deformable mirrors or specifically designed optics, the sensor will open the route to terahertz adaptive optics

Visualization 1: Development of a wavefront sensor for terahertz pulses

Temporal evolution of collimated planar THz beam Originally published in Optics Express on 07 March 2016 (oe-24-5-5203