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The present experimental work reports on the temperature measurements in a Bunsen flame, covered by a flat cooled plate from the top. The temperature field is measured based on the planar laser-induced fluorescence method for hydroxyl radical (OH) during the excitation of excitation Q1(8) line of the (1-0) band of the A2Σ+-X2Π electronic system. Thermometry was based on the imaging of the ratio of the fluorescence intensity for the band (2-0) and bands (0-0), (1-1). The paper presents the obtained temperature fields for the distances between the plate and the burner of 1, 2 and 3 calibres. The paper also concludes that the used method can be implemented using a single-pulse laser illumination and is effective for the detection of cold zones.