def test_simple(self):
child = simulated.Stage("stage", "test", axes=["x", "y"])
stage = AntiBacklashActuator("absact", "align", {"orig": child},
backlash={"x": 100e-6, "y": -80e-6})
# moves should just go the same positions
# abs
test.assert_pos_almost_equal(stage.position.value, {"x": 0, "y": 0})
f = stage.moveAbs({"x": 1e-06, "y": 2e-06})
f.result()
test.assert_pos_almost_equal(stage.position.value, {"x": 1e-06, "y": 2e-06})
test.assert_pos_almost_equal(child.position.value, {"x": 1e-06, "y": 2e-06})
f = stage.moveAbs({"x": 0, "y": 0})
f.result()
test.assert_pos_almost_equal(stage.position.value, {"x": 0, "y": 0})
test.assert_pos_almost_equal(child.position.value, {"x": 0, "y": 0})
f = stage.moveAbs({"x": -23e-06, "y": -15e-06})
f.result()
test.assert_pos_almost_equal(stage.position.value, {"x":-23e-06, "y":-15e-06})
test.assert_pos_almost_equal(child.position.value, {"x":-23e-06, "y":-15e-06})
# rel
f = stage.moveAbs({"x": 0, "y": 0})
f = stage.moveRel({"x": 1e-06, "y": 2e-06})
f.result()
test.assert_pos_almost_equal(stage.position.value, {"x": 1e-06, "y": 2e-06})
test.assert_pos_almost_equal(child.position.value, {"x": 1e-06, "y": 2e-06})
f = stage.moveRel({"x": 0, "y": 0})
f.result()
test.assert_pos_almost_equal(stage.position.value, {"x": 1e-06, "y": 2e-06})
test.assert_pos_almost_equal(child.position.value, {"x": 1e-06, "y": 2e-06})
f = stage.moveRel({"x": -1e-06, "y": -2e-06})
f.result()
test.assert_pos_almost_equal(stage.position.value, {"x": 0, "y": 0})
test.assert_pos_almost_equal(child.position.value, {"x": 0, "y": 0})
def test_limited_backlash(self):
"""
Test when backlash doesn't involve all axes
"""
child = simulated.Stage("stage", "test", axes=["a", "b"])
stage = AntiBacklashActuator("absact", "align", {"orig": child},
backlash={"a": 100e-6})
# moves should just go the same positions
# abs
test.assert_pos_almost_equal(stage.position.value, {"a": 0, "b": 0})
f = stage.moveAbs({"a": 1e-06, "b": 2e-06})
f.result()
test.assert_pos_almost_equal(stage.position.value, {"a": 1e-06, "b": 2e-06})
test.assert_pos_almost_equal(child.position.value, {"a": 1e-06, "b": 2e-06})
f = stage.moveAbs({"b": 0})
f.result()
test.assert_pos_almost_equal(stage.position.value, {"a": 1e-06, "b": 0})
test.assert_pos_almost_equal(child.position.value, {"a": 1e-06, "b": 0})
f = stage.moveAbs({"a": -23e-06, "b": -15e-06})
f.result()
test.assert_pos_almost_equal(stage.position.value, {"a":-23e-06, "b":-15e-06})
test.assert_pos_almost_equal(child.position.value, {"a":-23e-06, "b":-15e-06})
f = stage.moveAbs({"a": -20e-06}) # negative position but positive move
f.result()
test.assert_pos_almost_equal(stage.position.value, {"a":-20e-06, "b":-15e-06})
test.assert_pos_almost_equal(child.position.value, {"a":-20e-06, "b":-15e-06})
# rel
f = stage.moveAbs({"a": 0})
f = stage.moveAbs({"b": 0})
f = stage.moveRel({"a": 1e-06, "b": 2e-06})
f.result()
test.assert_pos_almost_equal(stage.position.value, {"a": 1e-06, "b": 2e-06})
test.assert_pos_almost_equal(child.position.value, {"a": 1e-06, "b": 2e-06})
f = stage.moveRel({"a": 0, "b": 0})
f.result()
test.assert_pos_almost_equal(stage.position.value, {"a": 1e-06, "b": 2e-06})
test.assert_pos_almost_equal(child.position.value, {"a": 1e-06, "b": 2e-06})
f = stage.moveRel({"a": -1e-06, "b": -2e-06})
f.result()
test.assert_pos_almost_equal(stage.position.value, {"a": 0, "b": 0})
test.assert_pos_almost_equal(child.position.value, {"a": 0, "b": 0})
def test_move_update(self):
child = simulated.Stage("stage", "test", axes=["z"])
# Slow speed to give some chance of the move update to work
child.speed.value = {"z": 100e-6}
stage = AntiBacklashActuator("absact", "abs", {"orig": child},
backlash={"z": 100e-6})
self.called = 0
orig_pos = stage.position.value
stage.position.subscribe(self._on_position)
for i in range(10):
if i % 2:
d = 1
else:
d = -1
dist = d * (i + 1) * 10e-6
f = stage.moveRel({"z": dist}, update=True)
time.sleep(0.05) # 50 ms for 'user update'
f = stage.moveAbs(orig_pos, update=True)
f.result()
# If there is an antibacklash for each move against backlash, we should
# see ~ 16 moves. If only an antibacklash at the last move
# (or integrated in last move), we should see 11 or 12 moves.
self.assertLessEqual(self.called, 12)
test.assert_pos_almost_equal(child.position.value, orig_pos)
stage.terminate()
def test_limited_backlash(self):
"""
Test when backlash doesn't involve all axes
"""
child = simulated.Stage("stage", "test", axes=["a", "b"])
stage = AntiBacklashActuator("absact", "align", {"orig": child},
backlash={"a": 100e-6})
# moves should just go the same positions
# abs
self.assertPosAlmostEqual(stage.position.value, {"a":0, "b":0})
f = stage.moveAbs({"a":1e-06, "b":2e-06})
f.result()
self.assertPosAlmostEqual(stage.position.value, {"a":1e-06, "b":2e-06})
self.assertPosAlmostEqual(child.position.value, {"a":1e-06, "b":2e-06})
f = stage.moveAbs({"b":0})
f.result()
self.assertPosAlmostEqual(stage.position.value, {"a":1e-06, "b":0})
self.assertPosAlmostEqual(child.position.value, {"a":1e-06, "b":0})
f = stage.moveAbs({"a":-23e-06, "b":-15e-06})
f.result()
self.assertPosAlmostEqual(stage.position.value, {"a":-23e-06, "b":-15e-06})
self.assertPosAlmostEqual(child.position.value, {"a":-23e-06, "b":-15e-06})
f = stage.moveAbs({"a":-20e-06}) # negative position but positive move
f.result()
self.assertPosAlmostEqual(stage.position.value, {"a":-20e-06, "b":-15e-06})
self.assertPosAlmostEqual(child.position.value, {"a":-20e-06, "b":-15e-06})
# rel
f = stage.moveAbs({"a":0})
f = stage.moveAbs({"b":0})
f = stage.moveRel({"a":1e-06, "b":2e-06})
f.result()
self.assertPosAlmostEqual(stage.position.value, {"a":1e-06, "b":2e-06})
self.assertPosAlmostEqual(child.position.value, {"a":1e-06, "b":2e-06})
f = stage.moveRel({"a":0, "b":0})
f.result()
self.assertPosAlmostEqual(stage.position.value, {"a":1e-06, "b":2e-06})
self.assertPosAlmostEqual(child.position.value, {"a":1e-06, "b":2e-06})
f = stage.moveRel({"a":-1e-06, "b":-2e-06})
f.result()
self.assertPosAlmostEqual(stage.position.value, {"a":0, "b":0})
self.assertPosAlmostEqual(child.position.value, {"a":0, "b":0})
def test_error(self):
child = simulated.Stage("stage", "test", axes=["a", "b"])
# backlash on non-existing axis
with self.assertRaises(ValueError):
stage = AntiBacklashActuator("absact", "align", {"orig": child},
backlash={"a": 100e-6, "x": 50e-6})
# move on non-existing axis
stage = AntiBacklashActuator("absact", "align", {"orig": child},
backlash={"a": 100e-6, "b": 50e-6})
with self.assertRaises(ValueError):
stage.moveRel({"a": -5e-6, "x": 5e-6})