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A novel low temperature bolometric method has been devised and implementedfor high-precision measurements of the microwave surface resistance of smallsingle-crystal platelet samples having very low absorption, as a continuousfunction of frequency. The key to the success of this non-resonant method isthe in-situ use of a normal metal reference sample that calibrates the absoluterf field strength. The sample temperature can be controlled independently ofthe 1.2 K liquid helium bath, allowing for measurements of the temperatureevolution of the absorption. However, the instrument's sensitivity decreases athigher temperatures, placing a limit on the useful temperature range. Usingthis method, the minimum detectable power at 1.3 K is 1.5 pW, corresponding toa surface resistance sensitivity of $\approx$1 $\mu\Omega$ for a typical 1mm$\times$1 mm platelet sample.Comment: 13 pages, 12 figures, submitted to Review of Scientific Instrument

Bolometric technique for high-resolution broadband microwave spectroscopy of ultra-low-loss samples