MHzPressure

IC2’s MHzPressure™ sensors are fully calibrated (both magnitude and phase) MHz-bandwidth sensors that enable quantifiable fluctuating pressure measurements in high-speed flows.

Based on IC2’s proven piezoelectric MEMS microphone technology, the small form factor offers drop-in replacement of existing instrumentation in scale wind-tunnel models.

With a full magnitude and phase response calibration, MHzPressure sensors provide unprecedented high-frequency pressure measurement accuracy and resolution, paving the way for advancements in hypersonic flight by providing aerospace engineers with a new tool to improve the fundamental understanding of high-speed transition to turbulence and validate computational models.

IC2’s MHzPressure sensors are designed from the ground up to be calibrated over the full operating bandwidth and are optimized for operation at frequencies up to 1 MHz.

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SKU: EP-1000 Category:

Lead Time and Pricing

Lead Time

8-12 Weeks

Sensor Model

EP-1000 (+$1,099)

Power Supply

Sensor Only (+$0), ASC-0401-SAL (+$499)

Calibration

Standard (+$0), Advanced (+$400)

Cable Length

2 meters (+$0), Custom Length (+$ Contact IC2)

mhzpressure-power-supply-options
WirelessArray Connection Diagram

Calibration Patent

Good Data Acquisition: How do you know you are getting good data?

The IC2 MHzPressure™ sensor is a fully calibrated, high-speed, fluctuating pressure sensor that enable wide-band performance for hypersonic flow measurement applications.

The fully calibrated sensor provides a direct replacement for existing sensors, enabling quantifiable dynamic pressure measurements in high-speed flows - a critical capability for reduced-scale testing of next-generation hypersonic vehicle and weapons designs.

Laminar-to-turbulent boundary layer transition is a key concern in the design of next-generation hypersonic vehicles and weapons; however, the ability to measure when and where transition occurs on a hypersonic article suffers from a lack of proper instrumentation.

NOTE: MHzPressure does not measure static pressure.

The advanced calibration method leverages the reciprocal nature of piezoelectric transduction, using an electrical drive signal to actuate the sensor in reverse and a laser vibrometer to sense the actuated deflection. Through established electromechanical relations, the sensitivity can be found to a high degree of certainty from this deflection measurement. The method is applicable at all frequencies up to and beyond the resonant frequency of the sensor, as actuation drive electronics and modern laser vibrometers are capable of much greater bandwidths (Mills et al., 2020). Benefits of the proposed sensor include a true MHz flat-band, a full frequency response calibration, and the ability to place the sensing element flush with the test article surface, all at a similar cost per channel to existing solutions.

Features

  • Full calibration (magnitude and phase) over the entire measurement range
  • Large dynamic range (>90dB)
  • Flush sensing element (~10µm)
  • Sensor roughness (<25µm)
  • Wide bandwidth (~1 MHz)
  • Minimum detectable pressure (MDP): ≤1 Pa (1.5e-4 psi) at 1 kHz, <0.1 Pa (1.5e-5 psi) above 10 kHz
  • Maximum linear pressure: 2.1 MPa (300 psi)
  • • -40 to 125°C continuous operating temperature, limited by electronics

Benefits

  • Accurate, quantified dynamic pressure measurements at frequencies up to 1 MHz
  • Reciprocal calibration (magnitude and phase) over the entire measurement bandwidth
  • Drop-in replacement of existing high-speed pressure sensors

Applications

  • Hypersonic flow measurements
  • Laminar-to-turbulent boundary layer transition detection
  • Second-mode instability experiments

Sensor Head Housing Details

  • Standard cylindrical package diameter: 3.18 mm
  • Standard cylindrical package length: 21 mm
  • Sensing element size: 0.42 mm
  • Rectangular sensor head for custom multi-sensor packages available upon request to enable tighter sensor spacing

Typical MHzPressure specifications; calibration sheets provided with each sensor

Model Bandwidth Resonant Frequency Sensitivity Max Linear Pressure Minimum Detectable Pressure
EP1000 50Hz-
50Hz-
900kHz
1MHz
@+3dB
@+4dB
1.6 MHz 0.9 uV/Pa 2.1 MPa (300 psi) <1 Pa @ 1 kHz
<0.1 Pa @ >10 kHz

FRF-magnitude

Relative magnitude response obtained using a laser vibrometer

FRF-phase

Relative phase response obtained using a laser vibrometer

Related Publications

Calibrated, MHz-Bandwidth, Dynamic Pressure Sensors for Quantitative Measurements in High-Speed Flows

A Novel, High-Frequency, Reciprocal Calibration Method for Dynamic Pressure Sensors Used in High-Speed Flows

A Flush-Mount, IEPE MEMS Piezoelectric Microphone for Aeroacoustic Applications

Related Projects

Calibrated, MHz-Bandwidth, Dynamic Pressure Sensors for Quantitative Measurements in Hypersonic Flows

High-Frequency Calibration System for Sensors Used in High-speed Airflow Measurements

High-Bandwidth Dynamic Pressure Sensors for BOLT Model Testing

Frequently Asked Questions

What are MHzPressure sensors?

IC2’s MHzPressure™ sensors are fully calibrated (both magnitude and phase) MHz-bandwidth sensors that enable quantifiable fluctuating pressure measurements in high-speed flows.

What is the typical application for MHzPressure Sensors?

MHzPressure Sensors are typically used in hypersonic (high-speed) flows to measure laminar-to-turbulent boundary layer transition and second-mode instability.

What is the operating temperature range for MHzPressure Sensors?

The operating temperature range (continuous) is -40°C to 125°C. Contact us with specific questions regarding temperature limits for intermittent and/or short-duration tests.

Does the sensor survive at high pressures?

MHzPressure is designed as a front vented AC only sensor. This means the sensor may be used in high static pressure environments (>300 psi) without affecting the sensor’s Max Pressure and/or Dynamic Range. For very high static pressure applications please contact IC2 for technical limits and best practices.

How is the sensor grounded?

The housing is electrically connected to the cable shield, which in turn is connected to the BNC shield/ground; however, the signal conditioner runs on batteries, so the ground for the sensor and signal conditioner should be the DAQ input. If installing the sensor in a metal model, IC2 can provide very thin (0.00025” wall thickness) heat shrink tubing that can be installed over the sensor housing to insulate the sensor from the model.

Do MHzPressure sensors measure static pressure?

No, MHzPressure sensors only measure fluctuating pressure over the bandwidth of ~50 Hz – ~1 MHz.

Does each sensor need its own power supply?

Yes. Each sensor requires a dedicated power supply and each unit supports a single sensor at a time. Engineering services are available for customers who desire custom configurations of power supplies to support multiple sensors.

How cautious should I be when handling the sensor?

The sensing element (the front face) is extremely fragile. Any physical contact with the exposed sensing element can cause damage to the sensor. A protective cap is provided for handling purposes and should be used to keep the sensor face covered at all times when not in use. Proper sensor cleaning procedures are outlined in the provided User Manual.

How are MHzPressure sensors calibrated?

These sensors are calibrated using a patented technique leveraging a laser vibrometer to perform a high-frequency reciprocal transducer calibration. This calibration technique allows IC2 to obtain accurate, quantifiable calibrations across the entire measurement bandwidth.

What is the difference between standard and advanced calibration?

The standard calibration is an acoustic calibration at 1kHz and a resonance measurement using a laser vibrometer. The advanced calibration is the standard calibration plus a full magnitude and phase response across the entire bandwidth using the laser vibrometer.