Test adapter and method for achieving optical alignment and thermal coupling thereof with a device under test
Independent assemblies are compliantly mounted to a force transfer mechanism to optically align and thermally couple a device under test (DUT) to a test apparatus. A first assembly includes an optical connector. The first assembly has an alignment feature and a first compliant interface. A second assembly includes a thermal control member and force transfer members coupled to a structure. A passage permits a portion of the arm of the first assembly to extend through the structure. The force transfer members provide respective seats for an additional compliant interface. The alignment feature engages a corresponding feature to align the optical connector with the DUT before the compliant interfaces compress under an external force. Compliant mounting of the assemblies accommodates manufacturing tolerances in the DUT so that contact forces on the DUT are relatively consistent and thereby enable consistent optical and thermal coupling between the test apparatus and the DUT.
1. An apparatus for providing independent optical alignment and thermal coupling between the apparatus and a device under test (DUT), the apparatus comprising:
a first assembly comprising:
a plate compliantly mounted and arranged to support an optical connector on an arm extending from the plate; and
a first alignment feature arranged to align the optical connector to the device under test; and
a second assembly independent from the first assembly, the second assembly comprising:
a first thermal control member compliantly mounted and having a first surface arranged to contact a corresponding surface of the DUT, the first thermal control member forming a recess for receiving the arm extending from the plate.
2. The apparatus of claim 1 , wherein the first assembly has a first compliant interface and the second assembly has a second compliant interface.
3. The apparatus of claim 2 , wherein when the first compliant interface and the second compliant interface are contacted by an external force, the first alignment feature aligns the DUT with the optical connector before the thermal control member of the second assembly contacts the DUT.
4. The apparatus of claim 1 , further comprising:
a third assembly independent from the first and second assemblies, the third assembly comprising:
a second thermal control member compliantly mounted and having a second surface arranged to contact a corresponding surface of the DUT.
5. The apparatus of claim 4 , wherein the third assembly has a third compliant interface.
6. The apparatus of claim 4 , wherein the first assembly, the second assembly, and the third assembly accommodate variation across respective corresponding features of the DUT.
7. The apparatus of claim 6 , further comprising:
a fourth compliant interface between the second assembly and the third assembly to control the relative positions of the second assembly and the third assembly.
8. The apparatus of claim 7 , wherein one of the compliant interfaces comprises rubber.
9. The apparatus of claim 8 , wherein the compliant interfaces are formed from a sheet of a material such that each compliant interface has a substantially similar density and thickness.
10. The apparatus of claim 5 , wherein the first compliant interface, the second compliant interface, and the third compliant interface, are attached to a strike plate.
11. The apparatus of claim 5 , wherein the second assembly and the third assembly have independent heat transfer elements.
12. The apparatus of claim 11 , wherein the independent heat transfer elements comprise active heat transfer elements.
13. The apparatus of claim 1 , wherein the first alignment feature is a pin.
14. The apparatus of claim 13 , wherein the pin has a tapered distal end.
15. The apparatus of claim 1 , wherein the optical connector is attached to the plate by an arm and by a carriage.
16. The apparatus of claim 1 , wherein the optical connector comprises an array of sensors.
17. A method for achieving optical alignment and thermal coupling between a device under test (DUT) and a test adapter, the method comprising:
introducing a test adapter that includes independent assemblies, a first assembly including a plate compliantly mounted and arranged to support on an arm extending from the plate an optical connector and an alignment feature, a second assembly including a thermal control member coupled to opposed force transfer members, the thermal control member forming a recess for receiving the arm extending from the plate;
providing a first compliant interface between the first assembly and an external force transfer mechanism;
providing a second compliant interface between the second assembly and the external force transfer mechanism;
introducing a DUT having a respective alignment feature in close proximity to the test adapter; and
engaging the external force transfer mechanism to move the test adapter toward the DUT along an axis that is substantially parallel to a longitudinal axis of the alignment feature, the alignment feature of the test adapter engaging a respective feature of the DUT to align a photosensitive device in the optical connector with an optical emitter in the DUT before a force capable of compressing the compliant interfaces is applied by the external force transfer mechanism.
18. The method of claim 17 , wherein engaging the external force transfer mechanism results in a fluid and continuous motion to align the test adapter and DUT until the engaging results in compression of the compliant interfaces and application of a distributed contact force via the compliantly mounted assemblies to the DUT.
19. The method of claim 17 , wherein providing the first compliant interface, and providing the second compliant interface includes applying a layer of rubber to the respective assemblies.
20. The method of claim 17 , wherein introducing a test adapter comprises introducing more than one thermal control assembly.