# Underwater acoustic unit conversion

• A
• nauman

#### nauman

Hi all

I have acoustic noise level value in dB vs 1 dyne/sq cm e.g. -10 db vs 1 dyne / sq cm. I need to convert it into dB ref 1upa unit. How i will convert it?

Thanks & Regards

## 1. How do I convert decibels to pascals in underwater acoustics?

To convert decibels (dB) to pascals (Pa) in underwater acoustics, you can use the formula: Pa = 10^(dB/20). This is also known as the decibel-to-pascal conversion factor.

## 2. What is the difference between dB re 1 μPa and dB re 1 μPa^2/Hz in underwater acoustics?

dB re 1 μPa and dB re 1 μPa^2/Hz are both units of sound pressure level (SPL) commonly used in underwater acoustics. The main difference is that dB re 1 μPa^2/Hz takes into account the frequency of the sound, while dB re 1 μPa does not. This means that dB re 1 μPa^2/Hz is a more precise measurement of sound pressure level.

## 3. How do I convert meters per second (m/s) to knots (kt) in underwater acoustics?

To convert meters per second (m/s) to knots (kt) in underwater acoustics, you can use the formula: kt = m/s * 1.94384. This is the standard conversion factor used in oceanography and underwater acoustics.

## 4. What is the reference sound speed used in underwater acoustic unit conversions?

The reference sound speed used in underwater acoustic unit conversions is typically 1500 m/s. This is the approximate speed of sound in seawater at a temperature of 20°C and a salinity of 35 parts per thousand.

## 5. Can I convert between different units of underwater acoustic measurements, such as dB re 1 μPa and dB re 1 μPa^2/Hz?

Yes, you can convert between different units of underwater acoustic measurements as long as you know the conversion factor between the two units. For example, to convert from dB re 1 μPa to dB re 1 μPa^2/Hz, you would use the conversion factor for sound pressure level (SPL) to sound intensity level (SIL), which is 2. To convert back, you would use the inverse conversion factor of 0.5.