many applications in the biotechnology pharmaceutical cosmetic and food and beverage industries these designs can also be used in waste water and chemical applications where many of the sterility and bio compatibility requirements can be relaxed or eliminated it is to be understood that these configurations can also be used to detect the natural fluorescence of a target analyte without the fluorophore spot in the majority of biotechnology pharmaceutical and food applications the analyte detection system needs to be contamination free and sterile before use these constraints often lead to the use of disposable components a disposable component in accordance with the present invention that can be used for phase fluorometry and that is compatible with the optical designs described in fig4 9 is shown in fig1 this figure depicts a system by which any of the optical collection geometries shown in fig4 through 9 can be employed for use in a sterile environment by way of example in fig1 a cpc similar to that used in fig6 is shown here 100 is the lining of a disposable bioreactor or the wall of a standard fermentor and 101 is a port similar to the type used to house a standard electrochemical dissolved oxygen or ph probe the disposable element 102 which is inserted into the port 101 is made.