Microchip measurement device
A microchip analysis device in which the effect of changes in the quantity of light of a discharge lamp of the short arc type can be reduced and measurement results with high reliability can be obtained is achieved in microchip measurement device which has a light source lamp and a lamp operating device, in which the light from the lamp is transmitted by a fill part for the liquid of the microchip to be tested, and in which the quantity of this transmitted light and based on the data obtained the decadic extinction of the liquid to be tested are measured, a device determines the fluctuation of the quantity of light from the light source lamp. Based on data from this device, a control interrupts or stops the detection of the quantity of the light transmitted by the microchip when the fluctuation is outside a preset range.
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.
2. Microchip measurement device in accordance with claim 1 , wherein the lamp voltage determination circuit comprises a constant voltage generating power source for generating a reference voltage, and an amplifier.
3. Microchip measurement device in accordance with claim 1 , wherein the means for determining the lamp light quantity comprises a light receiving element for direct reception of light emerging from the light source lamp, and wherein the control means compares data of the quantity of light from the light receiving element to a preset, given value and temporarily stops measurement of the quantity of light transmitted by the microchip when said data are outside a given range.