Biochip detecting device and light source detecting method thereof

A light source detecting method for a biochip detecting device, wherein the biochip detecting device is used to detect a biochip, and the biochip is adapted to receive a single incident light to produce an excitation light, both of the single incident light and the excitation light contain a specific wavelength, the biochip detecting device comprises a light source for generating the single incident light, a filter, a sensor, and a control module, and the control module is electrically connected to the sensor and the light source, wherein the light source, the single incident light, the biochip, the excitation light, and the sensor form a single optical path, the light source detecting method comprising:

• disposing a single optical attenuator on the single optical path and between the light source and the filter to replace the biochip and attenuate an intensity of the single incident light, wherein the single optical attenuator has a attenuation degree as the biochip to attenuate the intensity of the single incident light so as to replace the biochip under detection, and;
• driving the light source to produce the single incident light, and making the single incident light to sequentially pass through the single optical attenuator and the filter for being received by the sensor, such that the sensor generates a first sensing voltage corresponding to the intensity of the received light;
• obtaining the first sensing voltage by the control module, and determining whether the first sensing voltage complies with a predetermined requirement, so as to correspondingly adjust the intensity of the single incident light on the single optical path;
• and
• before disposing the single optical attenuator, driving the light source through a third driving voltage to produce another single incident light, and transmitting the other single incident light to the sensor through the filter, so that the sensor generates a third sensing voltage for transmitting to the control module, wherein the filter filters light with a wavelength other than the specific wavelength, the third sensing voltage is smaller than a saturation voltage of the sensor, the third driving voltage is smaller than a first driving voltage, and an initial detection on the light source has been implemented.