Wide-Band, Low-Noise, Low- Power Seismometer for SQM search and Lunar Science Talso Chui,Joseph Young (Jet Propulsion Laboratory, California Institute.

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Wide-Band, Low-Noise, Low- Power Seismometer for SQM search and Lunar Science Talso Chui,Joseph Young (Jet Propulsion Laboratory, California Institute of Technology) Ho Jung Paik (University of Maryland) Third International Conference on Particle and Fundamental Physics in Space April 21, 2006, Beijing, China. Konstantin Penanen

Why a Different Seismometer? Earth Seismometry: Background The USGS Low-Noise Model [Peterson, J., Observations and modeling of background seismic noise. Open-file report , U. S. Geological Survey, Albuquerque, New Mexico.]

Seismometer Concept (Contributed by Prof. Ho Jung Paik, UM) Pendulum natural frequency = f o = 0.4 Hz on the Moon Two pairs of capacitors for displacement measurement. Two pairs of capacitors for applying DC voltage to reduce f o and to balance tilt. Why reduce f o ? Thermal noise of seismometer: Target: Q = 10 4, f o = 0.01 Hz, m = 0.27 kg. Cross Section View C N1 C N2 C N4 C N3 Test Mass Capacitor Plates Cylindrical y x

Seismometer Fabrication (Contributed by Prof. Ho Jung Paik, UM) Seismometer Housing Seismometer Capacitor Plates Q = Frequency reduced from 1 Hz to 0.35 Hz.

Seismometer Electronics Concepts Used by LISA. LISA measurement scales to m-Hz -1/2 in x for x = m. [W. J. Weber et al., Class. and Quantum Grav. 19, 1751, 2002.] Based on ppm tunnel-diode oscillator [C. T. Van Degrift, Rev. Sci. Instrum. 46, 599 (1975).] Concept: A Concept: B A circuit board with two tunnel-diode oscillator circuits. It was populated with only one tunnel-diode for testing. Tunnel Diode X

Seismometer Based on Tunnel-Diode Oscillators TD OSC 1 Test Mass TD OSC 2 C1C2 LPF Mixer Counter ou t Computer Buffer Amp Buffer Amp z y x = z - y Seismometer based on tunnel-diode oscillator. Operates at wide temp. range: 400 K to 1K. Use very low power: <10 mW. Suitable for operation thru lunar night. A 5 kg Lithium Ion can supply 1 W through lunar night. Radioisotope Heater Unit (RHU) to keep electronics warm. y

Aeroflex/Metelics MBD 1057-H20 tunnel diode (modern part) Thermal Noise Thermal Noise + Shot Noise Tunnel-Diode Oscillator Evaluation (Contributed by Joseph Young) Square-root of the Allan variance  A Thermal Noise Limit: Shot Noise density

Tunnel-Diode Oscillator Evaluation (Contributed by Joseph Young) Temp. Change 290 K 0% 77 K+1.6% 4.2 K+3.7% Relative freq. change of a 10 MHz Oscillator versus Temp. Operates from 300 K to 4 K without adjustment Thermal Cycles: 20 times to 77K 6 times to 4K Continuously operated over 1 month.

Expected Seismometer Displacement Noise Density S y ( f ) 1/2 Apollo Seismometers Thermal Noise of Test Mass Tunnel-Diode Oscillator Noise Bridge Circuit, 15 V drive