BLACKBODY_RAD
Excel Usage
=BLACKBODY_RAD(T, wavelength)T(float, required): Temperature (K)wavelength(float, required): Wavelength (m)
Returns (float): Spectral radiance (W/(m^2srm))
Examples
Example 1: 800K at 4 micrometers
Inputs:
| T | wavelength |
|---|---|
| 800 | 0.000004 |
Excel formula:
=BLACKBODY_RAD(800, 0.000004)Expected output:
1311694129.74309
Example 2: Sun temperature at visible wavelength
Inputs:
| T | wavelength |
|---|---|
| 5778 | 5e-7 |
Excel formula:
=BLACKBODY_RAD(5778, 5e-7)Expected output:
26375671624491.227
Example 3: Long wavelength (infrared)
Inputs:
| T | wavelength |
|---|---|
| 300 | 0.0001 |
Excel formula:
=BLACKBODY_RAD(300, 0.0001)Expected output:
19353.47234
Example 4: Short wavelength UV
Inputs:
| T | wavelength |
|---|---|
| 6000 | 1e-7 |
Excel formula:
=BLACKBODY_RAD(6000, 1e-7)Expected output:
458894958.84679
Python Code
from ht.radiation import blackbody_spectral_radiance
def blackbody_rad(T, wavelength):
"""
Spectral radiance of a blackbody.
See: https://ht.readthedocs.io/en/latest/ht.radiation.html#ht.radiation.blackbody_spectral_radiance
This example function is provided as-is without any representation of accuracy.
Args:
T (float): Temperature (K)
wavelength (float): Wavelength (m)
Returns:
float: Spectral radiance (W/(m^2*sr*m))
"""
try:
return float(blackbody_spectral_radiance(T=float(T), wavelength=float(wavelength)))
except Exception as e:
return f"Error: {str(e)}"