A measuring unit for use in a sensor utilizing the phenomenon of attenuation in total internal reflection includes a dielectric block which is transparent to a light beam and has a flat and smooth surface on which a film layer is formed, and a flow passage member held in close contact with the film layer. The flow passage member is provided with a passage comprising a supply passage extending from an inlet of the flow passage member to a measuring portion and a discharge passage extending from the measuring portion to an outlet of the flow passage member.
1. A measuring unit comprising
a dielectric block which is transparent to a light beam and has a flat and smooth surface on which a film layer is formed, and
a flow passage member held in close contact with the film layer,
wherein the flow passage member is provided with a passage comprising a supply passage extending from an inlet of the flow passage member to a measuring portion and a discharge passage extending from the measuring portion to an outlet of the flow passage member,
wherein the flow passage member is formed by an elastic material, and
wherein the flow passage member is provided with a slit portion or a septum portion at its inlet portion and/or outlet portion.
2. The measuring unit as defined in claim 1 , wherein the flow passage member comprises:
a plurality of supply passages;
a plurality of inlets; and
a plurality of outlets,
wherein each one of the plurality of supply passages respectively extend between one of the plurality of inlets and one of the plurality of outlets.
3. The measuring unit as defined in claim 1 , wherein the flow passage member comprises:
an upper portion; and
a seal portion, the seal portion integrally formed with the upper portion,
wherein the seal portion is held in close contact with the film layer.
4. The measuring unit as defined in claim 3 , wherein the seal portion is an O-ring.
5. The measuring unit as defined in claim 3 , wherein the flow passage member is provided with at least one of a plurality of slit portions and a plurality of septum portions.
6. A measuring unit comprising
a dielectric block which is transparent to a light beam and has a flat and smooth surface on which a film layer is formed,
a flow passage member held in close contact with the film layer, and
a holding member which is engaged with the dielectric block to hold the flow passage member on one surface of the dielectric block,
wherein the flow passage member is provided with a passage comprising a supply passage extending from an inlet of the flow passage member to a measuring portion and a discharge passage extending from the measuring portion to an outlet of the flow passage member.
7. A measuring unit as defined in claim 6 in which the holding member is provided with a holding plate portion which is held in close contact with the surface of the flow passage member in which each of the inlet and the outlet is formed, and
the holding plate portion is provided with a tapered insertion hole tapered toward the flow passage member in a position opposed to the inlet or the outlet of the flow passage member.
8. A measuring unit as defined in claim 6 , further comprising an evaporation preventing member which seals the inlet and/or the outlet of the flow passage member and prevents a sample from evaporating.
9. A measuring unit as defined in claim 8 in which the holding member and the evaporation preventing member are formed integrally with each other.
10. A measuring unit as defined in claim 8 in which the holding member and the evaporation preventing member are formed separately from each other and are bonded together by an adhesive.
11. A measuring unit as defined in claim 6 , further comprising a first pipet chip which supplies a sample to the supply passage and a second pipet chip which sucks a sample from the discharge passage.
12. A measuring unit as defined in claim 6 in which the flow passage member is provided with a slit portion or a septum portion at its inlet portion and/or outlet portion.
13. A measuring unit comprising
a dielectric block which is transparent to a light beam and has a flat and smooth surface on which a film layer is formed,
a flow passage member held in close contact with the film layer, and
an evaporation preventing member which seals the inlet and/or the outlet of the flow passage member and prevents a sample from evaporating,
wherein the flow passage member is provided with a passage comprising a supply passage extending from an inlet of the flow passage member to a measuring portion and a discharge passage extending from the measuring portion to an outlet of the flow passage member.
14. A measuring unit as defined in claim 13 in which the evaporation preventing member is formed by an elastic material and formed with a slit in a position opposed to the inlet and/or the outlet of the flow passage member.