Patent ID: 7400406
Filing Date: 2008-07-15
Classification: G01N

Abstract:
1. Microchip measurement device, comprising: a fill part for a liquid to be tested; a light source lamp, light transmitted by the lamp being directed through the fill part for the liquid to be tested; a lamp operating device for operating the light source lamp; means for determining the quantity of light from the lamp, and for determining fluctuation of the quantity of light from the light source lamp based on data obtained as to the quantity of light from the lamp and measurement of the decadic extinction of the liquid to be tested; and control means for determining the quantity of lamp light based on data from the means for determining and for interrupting or stopping detection of the quantity of the transmitted when a fluctuation is determined; wherein the lamp operating device is driven by a constant current supply, wherein the means for determining the lamp light quantity comprises a lamp voltage determination circuit which, based on fluctuation of the operating voltage of the light source lamp, determines the light quantity fluctuation, and wherein the control means compares data of the lamp voltage determination circuit with a preset, given value and exercises control such that detection of the quantity of the light transmitted by the microchip is interrupted when said data are outside of a preset range.