JAXA is currently promoting Hayabusa-2 mission, which is the post Hayabusa including sample and return attempt to/from the near-earth asteroid. Hayabusa-2 challenges very interesting objectives: what are original organic matters and water existed in the solar system? Hayabusa-2 successfully performed two trials to collect less altered materials. This article mainly describes sensor technology developed in Hayabusa-2 mission, such as pin-point guidance and navigation, impactor, scientific observation, etc.
A sweat lactic acid (LA) monitoring system embedded on an armband for evaluation of exercise intensity was fabricated and real-time LA monitoring of a free-moving subject was conducted for the first time. The LA monitoring system utilizes an electrochemical biosensor which uses redox reaction of lactate oxidase immobilized on a screen-printed carbon graphite electrode. The volunteer wearing the system on the upper arm performed bouldering activity (climbing and 2 min rest alternately) in two different difficulty levels (100 and 150 degrees). Different secretion of LA was confirmed (11µg/cm2 /min for the 150 degrees course and 2µg/cm2 /min for the 110 degrees course). This indicates that the LA levels obtained with our system successfully reflected the metabolic status of the subject.
This paper addresses state analysis for pump based on the fractal dimension. For the state analysis based on fractal dimension, a contact type acceleration sensor has been used. We changed this sensor to a microphone which is no contact type sensor and measured with an actual pump. As the result, the fractal dimension calculated from the measured sound wave data was fluctuated depending on the state of the pump. And we confirmed that this method is useful for state analysis in equipment with complicated mechanisms which its abnormal frequency is not clear such as pumps.
This paper reports on an approach to fabricate c-axis-oriented PZT-based monocrystalline thin film with high insulation property on Si. We found that the insulation property of the PZT-based monocrystalline thin film on a buffer layer prepared via pulsed laser deposition (PLD) were relatably low. The particle-shaped debris generated in PLD perhaps led to this worse insulation property. It was also found that the insulation property can be improved by additional PZT deposition via a sol-gel process, while the c-axis orientation was decreased. Eventually, the PZT thin film on a buffer layer prepared via sputter deposition exhibited higher insulation property comparable with those of general PZT thin films. This study successfully gives a great knowledge for obtaining the electrically-reliable PZT-based monocrystalline thin film on Si.
In the field of life science such as drug discovery, technological innovation of molecular evolution is required. We have been studied Light Addressable Amperometric Sensor (LAAS) using organic and inorganic semiconductors as one of new technologies. Hybrid pn junction LAAS devices are fabricated by combining a plurality of organic materials with different Si types. We evaluated the developed devices in terms of concentration dependency and image measurement. As a result, concentration dependency was obtained in the range of 1 mM to 100 nM. Since this device can apply a reverse bias voltage, concentration dependency can be expected even in a further low concentration region.