Needle Hydrophone NH4000,0.05MHz-10MHz,Medical Ultrasound Calibration Sensor
Mode：NH4000
Type:QA-Instruments
Contact： ken@hkmedqc.com
Needle Hydrophone NH4000,0.05MHz-10MHz,Medical Ultrasound Calibration Sensor.PDF
NH4000 4.0mm Needle Hydrophone, Ultra High Sensitivity PVDF Hydrophone 0.05MHz-10MHz
The NH4000 4.0mm Needle Hydrophone delivers the highest sensitivity among the full series. Adopting PVDF (Polyvinylidene Fluoride) piezoelectric technology, it works with submersible preamplifier and DC coupler to form a complete testing system.Compliant with IEC 62127-3, it covers a frequency range of 0.05MHz~10MHz and is specially optimized for ultrasonic measurements below 1 MHz.Equipped with a 4.0mm large sensor element, it features an average sensitivity of 8.0 V/MPa across 0.05MHz~10MHz, capable of detecting ultra-weak acoustic signals as low as 7.5 Pa. The sensitivity variation between individual units is within ±3 dB for reliable and consistent performance.
Weighing 5.7g, the hydrophone is fully submersible and withstands hydrostatic pressure up to 2m water depth. It is widely used for medical ultralow frequency ultrasound calibration, weak sound field measurement, laboratory acoustic research and industrial low-frequency ultrasonic testing.
| Item | Specification |
|---|---|
| Model Number | NH4000 |
| Sensor Element Diameter | 4.0 mm |
| Sensor Element Thickness | 28 μm |
| Hydrophone Net Weight | 5.7 g |
| Transduction Method | Piezoelectric Conversion |
| Sensor Material | Polyvinylidene Fluoride (PVDF) |
| Mean Sensitivity (0.05 MHz ~ 10 MHz) | 8.0 V/MPa |
| Sensitivity Variation between Units | ± 3 dB |
| Operating Frequency Band | 0.05 MHz ~ 10 MHz |
| Optimized Frequency Range | Below 1 MHz |
| Measurement Uncertainty (0.05 MHz ~ 1 MHz) | 9 % |
| Measurement Uncertainty (1 MHz ~ 8 MHz) | 8 % |
| Measurement Uncertainty (9 MHz ~ 20 MHz) | 11 % |
| Minimum Detectable Acoustic Pressure | 7.5 Pa |
| Amplifier Saturation Pressure | 87.5 kPa |
| Maximum Safe Mechanical Pressure | 1 MPa |
| System Output Impedance | 50 Ω |
| Operating / Storage Temperature | 5 ℃ ~ 50 ℃ |
| Critical Damage Temperature | Above 60 ℃ |
| Sensitivity Temperature Drift | +0.6 % per ℃ temperature rise |
| Maximum Withstand Water Depth | 2 m |
| Recommended Calibration Cycle | Full calibration every 12 months, monthly routine check |
| Execution Standard | IEC 62127-3 |
| Installation Requirement | Needle tip facing directly to acoustic source |
FAQ
- What are the main application scenarios?
Optimized for ultralow frequency ultrasound below 1 MHz, applied to medical ultrasound calibration, weak sound field testing and laboratory acoustic research.
- What is the minimum detectable acoustic pressure?
It can accurately detect ultra-weak signal as low as 7.5 Pa for high-sensitivity precision measurement.
- What are the pressure limits?
The maximum safe mechanical pressure is 1 MPa. Amplifier nonlinearity occurs when pressure exceeds 87.5 kPa.
- Maintenance & calibration cycle?
Take out and dry after use. Full calibration every 12 months and routine sensitivity check every month.
NH4000 pin-type hydrophone, real photo of the British PA 4mm PVDF pin-type hydrophone product:
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