1. What is a Ruby Fluorescence Pressure Calculator?

Definition: This calculator estimates pressure based on the wavelength shift of ruby fluorescence under high-pressure conditions.

Purpose: It helps researchers and scientists determine pressure in diamond anvil cell experiments and other high-pressure applications.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P \) — Pressure (GPa)
• \( \lambda \) — Measured ruby fluorescence wavelength (nm)
• \( \lambda_0 \) — Reference wavelength at ambient pressure (typically 694.2 nm)

Explanation: The pressure is calculated from the ratio of the measured wavelength to the reference wavelength raised to the power of 10.71.

3. Importance of Ruby Pressure Scale

Details: Ruby fluorescence is a primary pressure gauge in high-pressure physics due to its reliable and reproducible wavelength shift under pressure.

4. Using the Calculator

Tips: Enter the measured ruby fluorescence wavelength and the reference wavelength (default 694.2 nm). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is ruby used for pressure measurement?
A: Ruby has a strong, sharp fluorescence line that shifts predictably with pressure, making it an excellent pressure sensor.

Q2: What's the typical reference wavelength (λ₀)?
A: The standard reference is 694.2 nm at ambient pressure and room temperature.

Q3: What is the valid pressure range for this scale?
A: This scale is typically valid up to about 150 GPa, though different scales may be needed for higher pressures.

Q4: How accurate is the ruby pressure scale?
A: The accuracy is typically ±0.1-0.5 GPa, depending on measurement conditions and calibration.

Q5: Does temperature affect the measurement?
A: Yes, temperature can affect the ruby fluorescence. Special corrections may be needed for non-ambient temperatures.