Theremino

Theremino HVSR Disk

The Theremino HVSR Disk is a platform with an ultra-low “UFO” profile to dramatically reduce wind noise. It offers -component geophones and flexible acquisition using either the MasterSMD V1 (Wired) or the IoT Module (ESP32 PICO Kit for Wi-Fi). Available for custom orders only.

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Theremino HVSR Disk: Ultra-Low Noise Seismic Acquisition (Built to Order)

The Theremino HVSR Disk is a specialized, low-profile enclosure engineered for high-sensitivity Horizontal-to-Vertical Spectral Ratio (HVSR) geological surveys. Its unique, flat, “UFO” shape drastically reduces the aerodynamic noise typically generated by wind interacting with taller instruments—a common problem for other systems.

This is a highly specialized, built-to-order system with customizable hardware. Please contact us for current lead times and to define your preferred configuration.

Designed for stability and precision, this unit provides an ideal platform for high-resolution, three-component seismic measurements.

Key Features and Design

  • Aerodynamic “UFO” Design: The ultra-low profile, just tall, is specifically engineered to minimize wind noise, allowing for reliable data acquisition even on windy days.

  • Optimal Stability: With a weight of , the disk ensures excellent ground coupling and stability, crucial for accurate passive seismic measurements.

  • Three-Component (3C) Measurement: The standard configuration supports three geophones (one vertical, two horizontal) for comprehensive HVSR analysis.

Customizable Configurations: Wired vs. Wireless

The HVSR Disk supports two powerful hardware configurations to match your specific precision and connectivity needs:

Configuration 1: Wired Precision (MasterSMD V1 + ADC24)

This setup is ideal for maximum resolution and direct USB-wired control.

Component Function Benefit
Theremino MasterSMD V1 Central USB Controller Manages communication and provides stable power via USB.
Theremino ADC24 Analog-to-Digital Converter Provides extreme resolution for measuring minute ground vibrations.
3 Geophones (1 Vertical, 2 Horizontal) Standard 3C array for precise HVSR analysis.
Configuration 2: Wireless Freedom (IoT Module – ESP32 PICO Kit + ADC24)

This setup provides high-resolution data acquisition with the flexibility of Wi-Fi communication, eliminating the need for long USB cables on site.

Component Function Benefit
Theremino IoT Module (ESP32 PICO Kit) Powerful Wi-Fi Controller Enables wireless data transmission over Wi-Fi, leveraging the power of the ESP32 for processing.
Theremino ADC24 Analog-to-Digital Converter Maintains high-resolution (24-bit) seismic data quality.
3 Geophones (1 Vertical, 2 Horizontal) Standard 3C array for precise HVSR analysis.

System Requirements

Regardless of the configuration, the HVSR Disk requires the following software:

  1. Theremino HAL Application: Essential for communicating with the Master or the IoT Module and configuring the ADC24 settings (gain, sampling rate).

  2. Specialized HVSR/Seismic Software: Used for logging the high-resolution data and performing the spectral ratio calculations (e.g., specific Theremino applications or third-party seismic software)

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