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福爾摩沙衛星五號儀器設備:

Mechanical specifications 機械規格 (updated: 04/11/2014)

The AIP consists of a sensor unit located on the top panel of the satellite and a Science Payload Electronics Unit (SPEU) housed inside the satellite. The sensor unit is made by NCU and the SPEU is made by T&C Technologies Inc., sub-contracted by NCU. The sensor unit, 100 mm L x 100 mm W x 100 mm H, has a sensor head and is mounted on a stand with a height of 300 mm to extend the field of view of the incoming plasma. The dimensions of SPEU are 180 mm L x 180 mm W x 60 mm H.



Item Material Dimension Mass property
Head 6061-T6 100 (L) x 100 (W) x 100.6 mm (H) 0.8617 kg
Stand 7075-T6 140 (L) x 130 (W) x 300 mm (H) 1.184 kg
SPEU 6061-T6 180 mm (L) x 180 mm (W) x 60 mm (H) 1.761 kg
Harness 1.747 kg
Total 5.554 kg

 

Ammeter specifications 電流計 (updated: 04/11/2014)

The sensor unit consists of a floating potential plate, an electrode of a planar Langmuir probe, and an entrance opening. A sweeping voltage is applied to the electrode of the planar Langmuir probe to obtain curves of electric current readings vs. the sweeping voltage. The inside of the sensor unit consists of four metal electroformed grids (100 lines per inch, 0.5 mil, and 1.6 mm between the grids) with specific voltages to screen the incoming plasma. The first dual grid, G1, is an aperture grid arranged in the front of the probe and is connected to the floating potential plate so that the plasma will not be affected by the transverse electric field and can reach the probe smoothly. The second grid, G2, is a retarding grid connected to a programmable sweeping voltage circuit between -10 and 10 V. If AIP operates in IT mode, the grid is maintained at the floating potential without repelling the incoming ions. In RPA mode, the grid forms a potential barrier (retarding voltage) to block low energy positive ions into the probe. The third grid, G3, is a suppressor grid maintained at -15 V to repel incoming electrons into a quadrant metal collector and can also reduce photoelectrons escaped from the collector when the solar extreme ultraviolet strikes on the collector. All four metal plates of the quadrant collector are maintained at the floating potential and are connected together to an ammeter via an analog switch.

Sensor Range Sensitivity Rate If noise level is 1 mV
IP0, IP1, IP2, and IP3 ±1.25 μA ±38.1 pA 0.5 μA/V or 2.0 mV/nA 0.5 nA →103 cm-3
IPT and PLP ±2.5 μA ±76.3 pA 1.0 μA/V or 1.0 mV/nA 1.0 nA →103 cm-3

Principles of measurement 量測原理 (updated: 04/14/2014)

Advance Ionospheric Probe (AIP) is an all-in-one plasma sensor to install on the FORMOSAT-5 satellite with sampling rate up to 8,192 Hz to measure ionospheric plasma concentrations (Ni), velocities (Vi), and temperatures (Ti and Te) over a wide range of spatial scales in a time-sharing way.

The AIP uses the following three sampling rates to acquire ionospheric plasma parameters:

  • NORMAL: 128 Samples/s.
  • FAST: 1,024 Samples/s.
  • BURST: 8,192 Samples/s.

Five basic measurement modes are listed as follows. More complex measurement modes can be realized via uploaded commands.
  • PLP: one electron temperature Te from an I-V curve per second.
  • RPA: one ion temperature Ti, ram velocity U, and ion composition Ci from an I-V curve per second.
  • IT: 128/1,024/8,192 total ion concentration Ni per second for NORMAL/FAST/BURST mode, respectively.
  • IDM: 32/256/2,048 sets of arrival angles θV and θH per second for NORMAL/FAST/BURST mode, respectively.
  • PRI: the AIP can operate PLP for one second, RPA for next second, and the IT/IDM for the third second sequentially. One Te , Ti, Ci , ion velocity Vi, and Ni are available every 3 seconds.