Patent ID: 7125163

Claim:
A calorimeter comprising: a body configured to admit and capture radiation, the body being further configured to absorb energy from the captured radiation, the body including: a first chamber having a first axis and being configured to receive a beam of radiation, the first chamber being further configured to absorb the beam of radiation; and a second chamber having a second axis that is not collinear with the first axis, the second chamber being configured to receive at least a portion of the beam of radiation, the second chamber being further configured to further absorb at least the portion of the beam of radiation, such that substantially all of the radiation is absorbed; a temperature sensor attached over a substantial portion of the body in thermal communication with a substantial portion of the body, the temperature sensor being configured to detect a change in temperature of a substantial portion of the body responsive to absorption of the captured radiation; and a cooling system configured to cool the body from temperatures elevated responsive to absorption of the captured radiation.